{"id":133519,"date":"2020-09-27T12:05:00","date_gmt":"2020-09-27T16:05:00","guid":{"rendered":"https:\/\/www.gunsamerica.com\/digest\/?p=133519"},"modified":"2020-09-27T12:05:00","modified_gmt":"2023-09-07T00:16:01","slug":"jp-rifles-variable-mass-operating-system-review","status":"publish","type":"post","link":"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/","title":{"rendered":"JP Rifles Variable Mass Operating System – Review"},"content":{"rendered":"\n
\"JP<\/figure>\n\n\n\n

I\u2019ve recently been playing with the JP VMOS, ordinarily for competition use I\u2019d prefer as little reciprocating weight in my AR as needed.  However, when using the large frame AR, the AR10 or SR25 platform.  There is a point where it would be nice to be able to have less issues with flattened primers or pierced primers, simply because you cannot get your gas system to use less pressure and still get reliable functioning.  If you\u2019re not running an adjustable gas system this is another way of solving problems as well.  Sure you can send your rifle off to a good \u2018smith and have it tuned to work with your primary load.  That\u2019s not what the majority of AR owners get into the platform for, the AR is the perfect tinkerers weapon.  Most everything can be done by the owner, it is pretty much a self sufficient platform.  You are also stuck having to rely on the load the \u2018smith tuned your rifle for.  <\/p>\n\n\n\n

\"JP
The weights can be added or subtracted as well as vary in weight.<\/figcaption><\/figure>\n\n\n\n

This is from the JP website,……..There’s no such thing as “one size fits all” in AR operating systems. Tuning your rifle is the only way to realize its potential and provide the performance you want. In some rifles, a little tuning is the difference between reliable function and reliable frustration<\/p>\n\n\n\n

The VMOS allows me to have more leeway with what is or isn\u2019t an overly pressured load.  This item seems to be perfect for the person who may not have the benefit of using the same exact load in their rifle every time.  If you\u2019re buying your ammo and switch brands or bullet weights based on what is available, this could help keep your rifle running more efficiently.  <\/p>\n\n\n\n

\"JP
Cases on the left show shiny spots, flattened primers and a partially pierced primer. Cases on right, shot with VMOS show no abnormal signs of pressure, Both sets of cases shot with the same load.<\/figcaption><\/figure>\n\n\n\n

I noticed the benefit when I was testing loads for a new rifle in 260rem. and was comparing the results from the 18\u201d barreled rifle to another one I had with a 22\u201d barrel.  The new rifle came with the VMOS and the 22\u201d gun had JP\u2019s Low Mass steel bolt carrier.  The 22\u201d gun had proven itself reliable and accurate,  but when I tried the loads from the 18\u201d gun.  The loads  that were showing zero high pressure signs, no shiny spots on case heads, no flattened primers, no issues whatsoever from it.  Suddenly, I was flattening primers and piercing primers, as well as sticky extraction.  I thought \u201cwhat the h\u20acll\u201d……….then it occurred to me to swap out the bolt carrier and retry.  BINGO!!!, all signs of over pressure disappeared.  The issue for the 22\u201d gun was that the BCG was opening up and starting to unlock from the breech while there was still significant pressures working on the case and in the chamber.  <\/p>\n\n\n\n

\"JP
Both VMOS and LMOS are coated in a very slick coating that is also very hard.<\/figcaption><\/figure>\n\n\n\n

By using the VMOS on my 22\u201d gun I can now safely push bullets to within 50fps of my bolt gun, with an increase in velocity of about 100fps across all the bullet weights I use.  You can see from the pictures that the primers have nice round corners and case heads show no shiny spots from ejectors.<\/p>\n\n\n\n

The VMOS, works by delaying the unlocking that fraction of a second so the pressure has a chance to subside.  It doesn\u2019t sound like much, and perhaps running a full weight BC would allow the same effect, but you can\u2019t tailor the stock carrier the way you can the VMOS.  Especially if you\u2019re running a suppressor on your rifle, now you can tailor you\u2019re own gun to run reliably with and without the can.  If you run a can on your rifle you really should look further into this.  <\/p>\n\n\n\n

\"JP
If you want to keep from taking your buffer tube off, you can simply grind the buffer detent down.<\/figcaption><\/figure>\n\n\n\n

It does add weight compared to a low mass operating system, and you will need to either remove your buffer detent in your buffer tube or as I did, simply grind it down with a roto tool and grinding stone.  However it allows you to use a wider range of loads and not have over gassing issues with your gun.<\/p>\n\n\n\n

\"JP
Once done though, your buffer constantly removes itself from the buffer tube, unless you go with a captured system.<\/figcaption><\/figure>\n\n\n\n

Overall, I think the benefits outweigh the detractors, and I plan on picking up a couple more for my large frame AR\u2019s.  When I do a review I try and list pro\u2019s and con\u2019s, so here is my take on the VMOS, you can decide for yourself. If you want more info and details, visit the JP website and look up VMOS under the pull down menu.<\/p>\n\n\n\n

Biggest Surprise: That it simply eliminates what was previously over pressure signs, with a simple drop in part.<\/p>\n\n\n\n

Biggest Disappointment: You are required to either swap your normal buffer assembly to a captured system or do away with your buffer detent.  At which point your buffer assembly exits the buffer tube every time you open up the two receivers.<\/p>\n\n\n\n

Most liked Feature: It can be tailored to work with your range of loads by you, no gunsmith required.  If you run into a problem call JP Rifles and they can talk you through any issues.<\/p>\n\n\n\n

Least liked Feature: The total weight it adds if you decide to go with a captured buffer system and the VMOS together.<\/p>\n\n\n\n

MSRP varies based on product but starts around $300<\/p>\n\n\nVisit JP Rifles for more information<\/a>\n\n\n

Buy and Sell on GunsAmerica!<\/a><\/em><\/strong><\/h2>\n","protected":false},"excerpt":{"rendered":"

The VMOS allows me to have more leeway with what is or isn\u2019t an overly pressured load. This item seems to be perfect for the person who may not have the benefit of using the same exact load in their rifle every time.<\/p>\n","protected":false},"author":126,"featured_media":133521,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_specdata_upc":"","_specdata_placement":"","footnotes":""},"categories":[35,59,7,109,72],"tags":[911,132,102,616,614,224],"featured":[],"hunt365":[],"class_list":{"0":"post-133519","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-accessories-misc","8":"category-ar-15-gear-reviews","9":"category-gunsamerica-authors","10":"category-gear-reviews","11":"category-columns-gunsmithing","12":"tag-ar","13":"tag-buzz","14":"tag-feature-articles","15":"tag-gear","16":"tag-gunsmithing","17":"tag-review"},"yoast_head":"\nJP Rifles Variable Mass Operating System - Review<\/title>\n<meta name=\"description\" content=\"JP Rifles Variable Mass Operating System - Review - Authors\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JP Rifles Variable Mass Operating System - Review\" \/>\n<meta property=\"og:description\" content=\"The VMOS allows me to have more leeway with what is or isn\u2019t an overly pressured load. This item seems to be perfect for the person who may not have the benefit of using the same exact load in their rifle every time.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\" \/>\n<meta property=\"og:site_name\" content=\"Gun Reviews and News | GunsAmerica.com\/Digest\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/gunsamerica\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-27T16:05:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-07T00:16:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2020\/09\/682B64C4-AAF1-45E0-B5A6-241DDFEF4696-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1912\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Trapr Swonson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@gunsamerica\" \/>\n<meta name=\"twitter:site\" content=\"@gunsamerica\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Trapr Swonson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\"},\"author\":{\"name\":\"Trapr Swonson\",\"@id\":\"https:\/\/gunsamerica.com\/digest\/#\/schema\/person\/aa54446219dfd2601600d8aebc0b09d2\"},\"headline\":\"JP Rifles Variable Mass Operating System – Review\",\"datePublished\":\"2020-09-27T16:05:00+00:00\",\"dateModified\":\"2023-09-07T00:16:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\"},\"wordCount\":1031,\"commentCount\":3,\"publisher\":{\"@id\":\"https:\/\/gunsamerica.com\/digest\/#organization\"},\"image\":{\"@id\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2020\/09\/682B64C4-AAF1-45E0-B5A6-241DDFEF4696-scaled.jpeg\",\"keywords\":[\"AR\",\"Buzz\",\"Feature Articles\",\"Gear\",\"Gunsmithing\",\"review\"],\"articleSection\":[\"Accessories Misc.\",\"AR-15\",\"Authors\",\"Gear Reviews\",\"Gunsmithing\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\",\"url\":\"https:\/\/gunsamerica.com\/digest\/jp-rifles-variable-mass-operating-system-review\/\",\"name\":\"JP Rifles Variable Mass Operating System - 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I\u2019d be called a traditionalist. I like and appreciate the latest tech, but really enjoy doing things the old ways. Experience\/Qualifications -USAF small arms instructor and competitor since the mid 1980\u2019s and continue providing small arms training to this day. -Started competing in archery and held state records, as well as part of the Texas state \u201cAll Recurve\u201d 3D team. Progressed to practical shooting competitions with handgun, rifle, and shotgun, and in early long range competitions. -Have represented the USA several times in international practical shooting. -Developed the best functioning and most reliable shortened stroke or \u201cstroke timing system\u201d modification for 3 gun-type Benelli Nova\/SuperNova shotguns. -Have hunted from Texas north to Montana and east to Minnesota plus some international hunts. -Currently retired after 27+ years as a firefighter, medical first responder. -Started a company that specializes in \u201cdestructive animal abatement\u201d, focusing on Canine, Feline, and Swine. 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I\u2019d be called a traditionalist. I like and appreciate the latest tech, but really enjoy doing things the old ways. Experience\/Qualifications -USAF small arms instructor and competitor since the mid 1980\u2019s and continue providing small arms training to this day. -Started competing in archery and held state records, as well as part of the Texas state \u201cAll Recurve\u201d 3D team. Progressed to practical shooting competitions with handgun, rifle, and shotgun, and in early long range competitions. -Have represented the USA several times in international practical shooting. -Developed the best functioning and most reliable shortened stroke or \u201cstroke timing system\u201d modification for 3 gun-type Benelli Nova\/SuperNova shotguns. -Have hunted from Texas north to Montana and east to Minnesota plus some international hunts. -Currently retired after 27+ years as a firefighter, medical first responder. -Started a company that specializes in \u201cdestructive animal abatement\u201d, focusing on Canine, Feline, and Swine. Trapr Ltd. has been in operation since 2007.","url":"https:\/\/gunsamerica.com\/digest\/author\/trapr-swonson\/"}]}},"featured_image_src":"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2020\/09\/682B64C4-AAF1-45E0-B5A6-241DDFEF4696-150x112.jpeg","_links":{"self":[{"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/posts\/133519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/users\/126"}],"replies":[{"embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/comments?post=133519"}],"version-history":[{"count":4,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/posts\/133519\/revisions"}],"predecessor-version":[{"id":187023,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/posts\/133519\/revisions\/187023"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/media\/133521"}],"wp:attachment":[{"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/media?parent=133519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/categories?post=133519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/tags?post=133519"},{"taxonomy":"featured","embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/featured?post=133519"},{"taxonomy":"hunt365","embeddable":true,"href":"https:\/\/gunsamerica.com\/digest\/wp-json\/wp\/v2\/hunt365?post=133519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}