{"id":93939,"date":"2018-07-28T21:01:17","date_gmt":"2018-07-29T01:01:17","guid":{"rendered":"https:\/\/www.gunsamerica.com\/blog\/?p=93939"},"modified":"2018-07-28T21:01:17","modified_gmt":"2023-08-30T21:51:34","slug":"sig-m4-rattler-conversion","status":"publish","type":"post","link":"https:\/\/gunsamerica.com\/digest\/sig-m4-rattler-conversion\/","title":{"rendered":"SIG\/M4 Rattler &#8211; Convert Your Existing SBR To A Rattler"},"content":{"rendered":"<p><a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1297.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93944\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1297-1024x680.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"680\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1297-1024x680.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1297-150x100.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1297-400x266.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1297-768x510.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1297.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a>Perhaps the most popular new cartridge in years has been the 300 AAC BLACKOUT.\u00a0 Shortly after it was made public, I had an opportunity to meet with Kevin Brittingham.\u00a0 At the time, he was still with Advanced Armament Corporation.\u00a0 He gave me the inside story of how AAC came to develop the new cartridge.\u00a0 The 300 AAC BLACKOUT cartridge was the result of a Request for Proposal from a special mission unit within the United States military.\u00a0 The unit wanted a .30 caliber cartridge that would utilize the standard 5.56 magazines and bolt.\u00a0 The RFP also proposed both a sub-sonic round for use with a suppressor and a supersonic round.\u00a0 Robert Silvers, Director of Research and Development for AAC, put pen to paper, or stylus to computer with the following objectives:<\/p>\n<ul>\n<li>Create a reliable and compact .30 caliber round for the AR platform;<\/li>\n<li>The round would utilize existing magazines and retain their full capacity;<\/li>\n<li>Create a sub-sonic round that is optimized for sound and flash suppression;<\/li>\n<li>Create a supersonic round that matches 7.63X39MM ballistics;<\/li>\n<li>Provide the ability to penetrate barriers with a high-mass projectile, and<\/li>\n<li>Provide a lightweight, durable, and low recoiling upper receiver.<\/li>\n<\/ul>\n<p>The end result is what is now known as the 300 AAC BLACKOUT.\u00a0 The 300 AAC BLACKOUT, or technically 7.62X35mm, has the same rim dimensions and cartridge taper as the 5.56.\u00a0\u00a0 This was a critical requirement in order to utilize the existing mil-spec 5.56 bolt and feed reliably from a standard 5.56 magazine.\u00a0 The configuration allows a standard M-4 to be converted to 300 AAC BLACKOUT by simply changing the barrel.<\/p>\n<p>A second requirement was to provide the operator with one rifle that could meet multiple mission requirements.\u00a0 Sub-sonic ammunition would allow the 300 AAC BLK to be a quiet and effective CQB platform while delivering a .30 caliber, 220 grain projectile on target.\u00a0 By changing to a supersonic round, the operator could have a fully capable battle rifle, effective to 300 yards and beyond.<\/p>\n<p>Most of the carbine offerings were in two configurations, either an 8\u201d short barrel rifle or a non-NFA 16\u201d configuration.\u00a0 The 9\u201d barrel is considered an ideal length for a traditional direct impingement carbine. I purchased one of the AAC MPW SBR carbines, along with the 762-SDN-6 suppressor.\u00a0 Both have proven reliable and the 762-SDN-6 has performed well with both supersonic and subsonic ammunition.\u00a0 However, the MPW, like most BLACKOUT carbines, is based on the original M-16 design.\u00a0 That design requires a recoil spring housed in a buffer tube extension.\u00a0 This design limits how compact these carbines can be made.<\/p>\n<p>In 2015, SIG introduced the SIG MCX series of carbines and changed the M-16\/M-4 world.\u00a0 The MCX utilizes a short stroke piston system with a captured recoil system that is contained within the upper receiver.\u00a0 This allows the MCX family of carbines to be equipped with a number of stock configurations, to include a folding stock.\u00a0 The MCX system has proven very successful and has been adopted by agencies.\u00a0 One of these is the newly constituted unit within the London\u2019s Metropolitan Police Counter Terrorist Specialist Firearms Officer program.\u00a0 As cool as the MCX is, many considered it \u201cjust another black rifle.\u201d<\/p>\n<p>Then came the SIG Rattler, the smallest production carbine on the market today.\u00a0 The Rattler uses the MCX operating system along with the same upper and lower receiver.\u00a0 However, the Rattler features a 5.5\u201d barrel and is chambered in 300 BLK.\u00a0 The Rattler became the darling for those in need of a Personal Defense Weapon (PDW) for protective details and covert operations.\u00a0 The Rattler also features an adjustable gas system that allows it to be run with and without a suppressor.<\/p>\n<p>SIG\u2019s SRD762Ti suppressor is the ideal suppressor for the PDW mission.\u00a0 The SRD762Ti is made from Grade 5 Titanium baffles that are precisely welded without the use of an external tube.\u00a0 This allows the 1.75\u201d diameter suppressor to have more volume than traditional designs.\u00a0 It is 9.25\u201d in length and weighs in at just over 18 oz.\u00a0 While ideal for the Rattler, it should be noted that the SRD762Ti is rated for .30 caliber cartridges up to 300 Winchester Magnum.\u00a0 SIG offers the SRD752Ti in both a direct thread and quick detach configuration.\u00a0 The SRD762Ti is a must-have accessory in order to make full operational use of the Rattler.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1282.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93943\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1282-1002x1024.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1002\" height=\"1024\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1282-1002x1024.jpg 1002w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1282-147x150.jpg 147w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1282-294x300.jpg 294w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1282-768x785.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1282.jpg 1174w\" sizes=\"(max-width: 1002px) 100vw, 1002px\" \/><\/a><\/p>\n<p>Over the last several years, there have been whispers that the special operations community, and specific units, have been utilizing carbines chambered in 300 BLK. \u00a0Reportedly, Black Hills manufactured a 110 TTSX load and a 201 gr. solid copper subsonic load for some of these units.\u00a0 Those who watch the defense industry blogs may have seen several solicitation notices for 300 BLK ammo.\u00a0 Recently, the FBI released a solicitation for ammunition for HRT.\u00a0 It appears that the 300 BLK is no longer just a niche or special interest cartridge.<\/p>\n<p>One of the more interesting solicitations from SOCOM was released in March of this year.\u00a0 The pertinent information is copied below:<\/p>\n<p>Personal Defense Weapon System Sources Sought<\/p>\n<p>The United States Special Operations Command (USSOCOM) is seeking to identify potential sources within the national technology and industrial base with the ability to provide a conversion kit for the M4A1 to create a Personal Defense Weapon (PDW) system:<\/p>\n<p>-Complete Kit to include upper receiver and buttstock kit<br \/>\n-Any tools required to complete an operational conversion<br \/>\n-A light and sound reducing suppressor that can be attached to the system when needed<\/p>\n<p>PDW Kit specifics: The kit must be adaptable to the standard M4A1 lower receiver, any modification to the lower receiver must be reversible and nonpermanent. The kit must be in .300 Blackout (BLK) cartridge, total system weight, including the M4A1 lower in not to exceed 5.5lbs. Length with stock extended not to exceed 26&#8243; length with stock collapsed or folded shall be 17&#8243; (T), 15&#8243; (O) and a height not to exceed 7.5&#8243;. The weapon shall be fully functional when collapsed or folded. The kit should include a 5.56mm barrel that can be changed from .300 BLK to 5.56mm in less than 3 minutes. Accuracy shall be 3.0 MOA (T), 2.0 MOA (O) @100 yds. and 5.0 MOA (T), 3.0 MOA (O) @ 300 yds. both in .300 BLK supersonic.<\/p>\n<p>This announcement constitutes a Sources Sought. It is not a solicitation or request for proposal, but an effort to obtain information for planning purposes only.<\/p>\n<p>The ability to convert existing M4A1 carbines to a PDW, chambered in 300 BLK, offers several appealing advantages.\u00a0 First, it is far more economical than purchasing complete carbines.\u00a0 Far more conversion kits can be purchased than complete carbines.\u00a0 Second, the purchase of a retrofit kit presents fewer issues than building a new carbine.\u00a0 Finally, should the receiver be damaged, the conversion kit can be fitted to another lower.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1433.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93958\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1433-852x1024.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"852\" height=\"1024\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1433-852x1024.jpg 852w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1433-125x150.jpg 125w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1433-250x300.jpg 250w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1433-768x923.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1433.jpg 998w\" sizes=\"(max-width: 852px) 100vw, 852px\" \/><\/a><\/p>\n<p>While I had been following the development of the Rattler for some time, I was not willing to go through the entire NFA Form 4 process.\u00a0 This all changed when SIG introduced the Rattler as a pistol.\u00a0 The pistol configuration featured a collapsible arm brace.\u00a0 I ordered one of the pistols with the intention of using it in place of one of my 300 BLK SBRs.\u00a0 Then came the SOCOM solicitation.\u00a0 I contacted SIG and they were able to ship me the conversion kit.\u00a0 I was now in business with a Rattler SBR.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1435.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93959\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1435-1024x957.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"957\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1435-1024x957.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1435-150x140.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1435-321x300.jpg 321w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1435-768x717.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1435.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>The conversion kit consists of an adaptor block that replaces the standard buffer tube.\u00a0 It is held in place with a large screw and extends approximately 1 \u00bc\u201d from the end of the lower receiver.\u00a0 The rear of the adaptor block is configured with a Picatinny style rail with three slots.\u00a0<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1436.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93960\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1436-1024x884.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"884\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1436-1024x884.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1436-150x130.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1436-347x300.jpg 347w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1436-768x663.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1436.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>The other component of the Rattler kit is the side folding stock.\u00a0 The stock has a cross bolt mount that interfaces with the adaptor plate and is secured with a large hex bolt.\u00a0 The folding stock extends approximately 7.5\u201d from the rear of the adaptor and 9.25\u201d from the rear of the upper receiver.\u00a0 The Rattler upper receiver is a direct replacement for the standard M4 upper receiver.\u00a0 It took me less than 10 minutes to convert one of my registered Smith &amp; Wesson M&amp;P SBR lowers to a full-blown Rattler!<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1438.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93962\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1438-743x1024.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"743\" height=\"1024\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1438-743x1024.jpg 743w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1438-109x150.jpg 109w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1438-218x300.jpg 218w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1438-768x1058.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1438.jpg 871w\" sizes=\"(max-width: 743px) 100vw, 743px\" \/><\/a><\/p>\n<p>I was immediately impressed with just how compact the Rattler is.\u00a0 With the stock folded, the overall length is right at 16.25\u201d!\u00a0 With the stock extended, the Rattler is 23.75\u201d in length. That is still a very short package.\u00a0 The operating system of the Rattler incorporates an easily adjusted gas block for running supersonic and subsonic loads.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1441.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93963\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1441-1024x929.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"929\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1441-1024x929.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1441-150x136.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1441-331x300.jpg 331w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1441-768x697.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1441.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>For an optic, I reached out to Aimpoint for one of the new CompM5 red dot optics.\u00a0 The CompM5 is the latest generation of Micro size optics but is not in the Micro family.\u00a0 The CompM5 was developed to be a ruggedized optic that can withstand the harshest operating environment.\u00a0 The CompM5 is powered by a single AAA battery and eliminates the issues involved with flying with the CR123 lithium batteries.\u00a0 It is fully compatible with all generations of night vision optics and Aimpoint\u2019s 3X magnifiers.\u00a0 For more details about the upgraded performance and electronics, visit Aimpoint\u2019s website at <a href=\"https:\/\/us.aimpoint.com\/news\/aimpoint-launches-new-compm5tm-sight\/\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\">https:\/\/us.aimpoint.com\/news\/aimpoint-launches-new-compm5tm-sight\/<\/a>\u00a0<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1443.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93965\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1443-1024x965.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"965\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1443-1024x965.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1443-150x141.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1443-318x300.jpg 318w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1443-768x724.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1443.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>I also installed an extra set of Troy Industry backup iron sights as a secondary means of shooting.\u00a0 The sharp reader will notice several range photos where I have the front lens cover on the CompM5 closed.\u00a0 This was intentional!\u00a0 Shooting with both eyes open, the dot will superimpose itself on the target as with the Armson OEG sights.\u00a0 <a href=\"https:\/\/www.armsonusa.com\/armsonoeg.html\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\">Armson USA OEG<\/a><a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1299.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93946\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1299-1024x680.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"680\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1299-1024x680.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1299-150x100.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1299-400x266.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1299-768x510.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1299.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>On the range, I tested the Rattler, from a bench rest, at 50-yards, using the CompM5 and the 3X magnifier.\u00a0 A phone call to my partners at Federal, Hornady, and SIG allowed me to test the Rattler with seven different loads.\u00a0 All bench testing was done with the SRD762Ti in place for both sound reduction and to test reliability.\u00a0 The suppressed Rattler was 100% reliable with all of the loads and, as reflected in the accompanying chart, all loads produced groups less than 1\u201d.\u00a0 For full disclosure, I suffer from astigmatism and even the sharp dot on the CompM5 became pixilated.\u00a0 This made maintaining a consistent point of aim difficult.\u00a0 To offset shooter error, I measured the best three shots out of a five shot group.\u00a0 I found the stock to be incredibly solid and it locked up with no play or shift.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3269.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93967\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3269-1024x768.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"768\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3269-1024x768.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3269-150x113.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3269-400x300.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3269-768x576.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3269.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>I zeroed the Rattler for the new Hornady 190 Sub-X ammo, knowing that would be my \u201cgo to\u201d round for dispatching critters etc.\u00a0 During the range test, the first anomaly I noticed was that supersonic loads had not only an elevation shift from point of zero, but also a very noticeable windage shift.\u00a0 In some cases, the windage shift was as great as 3 to 4 inches from point of aim.\u00a0 The second item I found was that the Rattler would not function subsonic loads without a suppressor.\u00a0 The gun short stroked every subsonic load, regardless of gas setting.\u00a0 I was very impressed with the performance of the SRD762Ti suppressor when using both the supersonic and the amazingly quiet subsonic loads.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3270.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93968\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3270-1024x672.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"672\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3270-1024x672.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3270-150x98.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3270-400x262.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3270-768x504.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3270.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>I contacted John Hollister, SIG guru and an all around good guy, to see what was going on.\u00a0 John and I have been friends from his days at AAC and he has always been a straight shooter and never shied away from the tough questions.\u00a0 John said that both issues were \u201cnormal\u201d for the Rattler.\u00a0 SIG worked very hard to gas the gun properly to run suppressed and unsuppressed, to ensure maximum reliability.\u00a0 A byproduct is that the Rattler will not cycle most subsonic loads without the additional back pressure that is generated by a suppressor.\u00a0 With regard to the shift in impact, John stated that the shift was the result of the different kinetic energy between the different rounds.\u00a0 The supersonic rounds \u201cwhip\u201d the barrel differently than the slower subsonic rounds and is not specific to just the Rattler.\u00a0 This shift is predictable and one of the results of designing a small platform to run with bullet weights that go from 85 grains to 200 grains or heavier.\u00a0 Given the true operating parameters of a PDW in a covert or PSD role, it is unlikely that the operator would be changing between to dramatically different loads.\u00a0 Still, it is a drawback that should be understood and accounted for.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1261.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93970\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1261-1024x699.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"699\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1261-1024x699.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1261-150x102.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1261-400x273.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1261-768x524.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1261.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>If I were setting up the Rattler for a protective detail, or a low profile mission, I would probably zero it with Federal\u2019s 110 grain Solid Copper HP or the Hornady Black 110 V-Max load.\u00a0 In a defensive environment, where keeping the weapon concealed is essential, there would be very little opportunity to install the suppressor if a fight starts.\u00a0 For offensive actions, such as direct action raids, I would probably choose Hornady\u2019s new 190 SUB-X load to run with the SRD762Ti installed.\u00a0 This load has a very low signature when used with a suppressor, and offers improved terminal ballistics over the typical 220 gr. SMK round.\u00a0 Speaking of keeping a low profile, the Rattler fits well in the smallest backpacks and tennis racket cases.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1274.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93941\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1274-1024x729.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"729\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1274-1024x729.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1274-150x107.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1274-400x285.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1274-768x547.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1274.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>The Rattler is a very mission specific platform that has changed the paradigm of the PDW as we know it.\u00a0 It is compact, versatile, and reliable and is without any real competition in the industry today.\u00a0 For those who choose to go the NFA route, and already have a registered M4 lower, the conversion kit is a great solution.\u00a0 SIG also sells the full Rattler in a SBR model as well as the aforementioned pistol configuration.\u00a0 However, the best option may be the route I took.\u00a0 I can utilize the SBR in my home state and then install the upper on the pistol lower for travel outside the state.\u00a0 Indeed, that seems to be the best of both worlds.<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3820.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93969\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/IMG_3820-1024x718.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"718\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3820-1024x718.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3820-150x105.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3820-400x280.jpg 400w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3820-768x538.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/IMG_3820.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<table width=\"675\">\n<tbody>\n<tr>\n<td colspan=\"5\" width=\"586\">SIG M4 Rattler<\/td>\n<td width=\"89\"><\/td>\n<\/tr>\n<tr>\n<td>Load<\/td>\n<td>High<\/td>\n<td>Low<\/td>\n<td>Average<\/td>\n<td>ES<\/td>\n<td width=\"89\">Accuracy<\/td>\n<\/tr>\n<tr>\n<td>SIG 220 gr. SMK<\/td>\n<td>888<\/td>\n<td>854<\/td>\n<td>863<\/td>\n<td>34<\/td>\n<td width=\"89\">0.50&#8243;<\/td>\n<\/tr>\n<tr>\n<td>SIG 125 gr. BHP<\/td>\n<td>1692<\/td>\n<td>1662<\/td>\n<td>1676<\/td>\n<td>30<\/td>\n<td width=\"89\">0.60&#8243;<\/td>\n<\/tr>\n<tr>\n<td>Hornady Black 110 gr. V-Max<\/td>\n<td>1912<\/td>\n<td>1806<\/td>\n<td>1839<\/td>\n<td>106<\/td>\n<td width=\"89\">0.05&#8243;<\/td>\n<\/tr>\n<tr>\n<td>Hornady 190 gr. Sub-X<\/td>\n<td>916<\/td>\n<td>884<\/td>\n<td>895<\/td>\n<td>32<\/td>\n<td>0.55&#8243;<\/td>\n<\/tr>\n<tr>\n<td>Hornady 135 gr. FTX<\/td>\n<td>1668<\/td>\n<td>1642<\/td>\n<td>1656<\/td>\n<td>26<\/td>\n<td>0.75&#8243;<\/td>\n<\/tr>\n<tr>\n<td>Federal 110 SCHP<\/td>\n<td>1662<\/td>\n<td>1644<\/td>\n<td>1653<\/td>\n<td>18<\/td>\n<td>0.80&#8243;<\/td>\n<\/tr>\n<tr>\n<td>Federal 150 gr. Fusion<\/td>\n<td>1455<\/td>\n<td>1447<\/td>\n<td>1451<\/td>\n<td>8<\/td>\n<td>0.80&#8243;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td colspan=\"6\">Velocity measured at 10 ft.\/Accuracy at 50 yds.\u00a0 Aimpoint Comp M5 w\/3X Magnifier<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>If you have not given the Rattler a look, I suggest you visit SIG\u2019s pages:<\/p>\n<a href=\"https:\/\/www.sigsauer.com\/store\/sig-mcx-rattler-psb.html\" campaign=\"SIGPSBRATTLER\" target=\"_blank\" class=\"clickTracking\">SIG MCX Rattler PSB<\/a>\n<a href=\"https:\/\/www.sigsauer.com\/store\/sig-mcx-rattler-sbr.html\" campaign=\"SIGSBRRATTLER\" target=\"_blank\" class=\"clickTracking\">SIG MCX Rattler SBR<\/a>\n<h1 style=\"text-align: center\"><strong><a href=\"https:\/\/www.gunsamerica.com\/Search\/Category\/629\/Guns\/Rifles\/Sigarms-Rifles.htm\" campaign=\"SIGRIFLES_GA\" target=\"_blank\" class=\"clickTracking\">***Shop GunsAmerica for your next Sig Rattler***<\/a><\/strong><\/h1>\n<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1422.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93955\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1422-1024x953.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"953\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1422-1024x953.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1422-150x140.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1422-322x300.jpg 322w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1422-768x715.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1422.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a>\n<a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1431.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93957\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1431-1024x976.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"976\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1431-1024x976.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1431-150x143.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1431-315x300.jpg 315w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1431-768x732.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1431.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><a href=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1423.jpg\" target=\"_blank\" class=\"clickTracking\" campaign=\"sig-m4-rattler-conversion\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\"><img loading=\"lazy\" decoding=\"async\" title=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" class=\"aligncenter size-large wp-image-93956\" src=\"https:\/\/www.gunsamerica.com\/blog\/wp-content\/uploads\/2018\/07\/DSC_1423-1024x910.jpg\" alt=\"SIG\/M4 Rattler - Convert Your Existing SBR To A Rattler\" width=\"1024\" height=\"910\" srcset=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1423-1024x910.jpg 1024w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1423-150x133.jpg 150w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1423-338x300.jpg 338w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1423-768x682.jpg 768w, https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2018\/07\/DSC_1423.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a>\n","protected":false},"excerpt":{"rendered":"<p>The ability to convert existing M4A1 carbines to a PDW, chambered in 300 BLK, offers several appealing advantages.\u00a0 First, it is far more economical than purchasing complete carbines.\u00a0 Far more conversion kits can be purchased than complete carbines.\u00a0 Second, the purchase of a retrofit kit presents fewer issues than building a new carbine.\u00a0 Finally, should the receiver be damaged, the conversion kit can be fitted to another lower.<\/p>\n","protected":false},"author":60,"featured_media":93944,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_specdata_upc":"","_specdata_placement":"","footnotes":""},"categories":[35,872,694,37,711,882],"tags":[218,132,102,108,1179,343,418,58],"featured":[],"hunt365":[],"class_list":{"0":"post-93939","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-accessories-misc","8":"category-gun-reviews-ar-15","9":"category-gun-reviews","10":"category-gun-reviews-rifles","11":"category-rob-garrett","12":"category-gear-suppressors","13":"tag-300-aac-blackout","14":"tag-buzz","15":"tag-feature-articles","16":"tag-guns","17":"tag-rattler","18":"tag-rifle","19":"tag-sbr","20":"tag-sig-sauer"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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