{"id":22000,"date":"2014-07-18T14:02:20","date_gmt":"2014-07-18T18:02:20","guid":{"rendered":"http:\/\/www.gunsamerica.com\/blog\/?p=22000"},"modified":"2026-01-28T13:03:44","modified_gmt":"2026-01-28T19:03:44","slug":"cmmg-9mm","status":"publish","type":"post","link":"https:\/\/gunsamerica.com\/digest\/cmmg-9mm\/","title":{"rendered":"CMMG’s 9mm Mk9, an ideal PDW–Gun Review"},"content":{"rendered":"

[one_half padding=”0 0 0 0px”]<\/p>\n

CMMG Mk9 PDW<\/h2>\n

[\/one_half]<\/p>\n

[one_half_last padding=”0 0 0 0px”]<\/p>\n\n

CMMG Mk9 PDW<\/h2>\n

\" target=\"_blank\" class=\"clickTracking\">\"Buy<\/a>\n

[\/one_half_last]<\/p>\n

\"CMMG\"<\/a>

The Mk9 is a compact gun that adds a twist to conversations about practical pistol caliber carbines.<\/p><\/div>\n

The CMMG<\/a> Mk9 PDW is one of those guns often defined by what it is not. It is not a modern sporting rifle<\/em>, exactly. It isn\u2019t a 5.56. It is not a traditional AR pistol (if such a thing exists). But if you\u2019re looking for something larger, faster, and more stable than a full-sized pistol, the Mk9 may be for you. If you are looking for something smaller and less powerful than an AR carbine, the Mk9 is an ideal choice. Not quite a carbine, more than a pistol: the Mk9 shines.<\/p>\n

By the numbers<\/h2>\n

\u2022\u00a0\u00a0 \u00a0Caliber: 9mm
\n\u2022\u00a0\u00a0 \u00a0Barrel: 8.5″ medium weight profile
\n\u2022\u00a0\u00a0 \u00a0Muzzle: A2 comp., threaded 1\/2-36(9mm)
\n\u2022\u00a0\u00a0 \u00a0Hand Guard: CMMG RKM7 KeyMod hand guard
\n\u2022\u00a0\u00a0 \u00a0furniture: Magpul MOE pistol grip
\n\u2022\u00a0\u00a0 \u00a0Receivers: Forged 7075-T6 AL M4 type upper, AR15 type lower
\n\u2022\u00a0\u00a0 \u00a0Trigger: Single stage mil-spec style trigger
\n\u2022\u00a0\u00a0 \u00a0Weight: 5.3 lbs (unloaded)
\n\u2022\u00a0\u00a0 \u00a0Length: 25\u201d<\/p>\n

\"CMMG\"<\/a>

With a good single-point sling, the CMMG Mk9 becomes very maneuverable.<\/p><\/div>\n

This Mk9 is a 9mm, but the pistol is available in 300 Blackout, and .22LR<\/a>. Much of the specifications are easy to see in the photos. The one piece that deserves a bit of ink is the magazine. It is designed to hold 32 rounds, and the spring tension is seriously tight. It help to load on something solid as you\u2019ll need to use a bit of bump-force to get some of the rounds seated, especially as the count rises.<\/p>\n

The trigger on the Mk9 breaks at about 6 pounds. Just under. As it is described as a mil-spec style trigger, this seems appropriate. It has a touch of mil-spec style creep, too, but that doesn\u2019t keep it from being functional. The break is sufficient for a pistol meant for close, fast, adrenaline-fueled use.<\/p>\n

How do you hold the Mk9?<\/h2>\n

The CMMG Mk9 PDW is appropriately named. It is a great personal defense weapon. That it is a pistol seems almost like a formality. The CMMG Mk9 PDW is almost too big to be taken seriously as a pistol. I\u2019m not talking about the legal definition; I\u2019m referring to how it handles. You can hold it with one hand, like a pistol, but it isn\u2019t balanced well for such a grip. You can cram two hands on the actual grip and hold it like you would a compact pistol, but that, too, leaves a lot of weight hanging out in front of the gun.<\/p>\n

\"CMMG\"<\/a>

Holding the pistol with two hands and the sling is harder than it looks, as it stretches out the elastic of the sling.<\/p><\/div>\n

When you move your support hand up to the mag well or to the handguard, the balance problem goes away, but the pistol still requires some stability to perform reliably. If you hold like this while moving, finding the target is much more complicated than it would be with a light pistol or an actual carbine.<\/p>\n

Adding a sling to the equation will stabilize the back end and help a bit, though I\u2019d recommend using one with some elastic to give you a bit more flexibility. The Mk9 comes with a sling plate, which could be swapped out for a QD plate. The key-mod slots on the handguard can be used as QD slots if you want a two point, or you could just add a sling loop on handguard if you don\u2019t want to monkey with the buffer tube. Key-mod seems to be the in-thing right now, as does QD. It would make sense to have a QD mount on the pistol from the factory, but it is easy to swap out.<\/p>\n

Perhaps the easiest way to hold the pistol is with the buffer tube back in your shoulder. While it crunches you up on the compact gun, the stance is surprisingly functional thanks to the Mk9\u2019s low recoil. There is no muzzle rise, and virtually no recoil, so nothing is going to bop you in the teeth. We put on an Aimpoint PRO, and mounted it a bit farther forward than we would on an AR with a longer length of pull, and it worked incredibly well.<\/p>\n

\"CMMG\"<\/a>

With a Sig arm brace, the CMMG becomes even more functional.<\/p><\/div>\n

If you want to take it to the next level of performance, slip on a Sig arm brace. The buffer tube on the CMMG is fluted on the far end and knurled closer to the receiver. The Sig brace slides on with a bit of effort, and is a bitch to pull back off, but once it is on there, the potential is really endless. And that is where the PDW distinction becomes much more relevant.<\/p>\n

The CMMG Mk9 PDW is incredibly light. It isn\u2019t a burden to carry, at all, so long as you\u2019re engaging in really open carry. And it is small. The compact package, while big for a pistol, is more in line with typical short-barreled rifles. And it isn\u2019t overpowered. Many who criticize SBRs say that you lose too much of the 5.56\u2019s power when you cut down the barrel. With the Mk9, you are adding power to our typical expectations of the 9mm. A115 grain bullet will leave a Beretta 92 FS (which has a 4.85 inch barrel) above 1,100 FPS. The 8.5 inch barrel adds 1,000 FPS to that, maybe more. It is a modest increase, but still an increase.<\/p>\n

\"CMMG\"<\/a>

There’s no recoil to make this shooting position painful, though it does feel cramped.<\/p><\/div>\n

Shooting the Mk9<\/h2>\n

I\u2019ve covered the various handholds that make this gun a challenge. From here on out, you can assume I\u2019m bracing the CMMG pretty well before I pull the trigger. If there were some law that mandated a pistol grip on the Mk9, my practical evaluation of the platform wouldn\u2019t be positive. Yet I can hold the gun however I want, and the Mk9 comes alive when you give the back end some support.<\/p>\n

We shot the Mk9 at distances ranging form 7 to 100 yards. The 9mm shoots relatively flat. When engaging a 12 inch plate at both distances, I was able to use the same zero from the Aimpoint. No hold over necessary. That makes this a really versatile pistol. Beyond 100, you may need to begin to compensate slightly.<\/p>\n

\"CMMG\"<\/a>

Holding it out like you would a rifle is a bit awkward.<\/p><\/div>\n

Accuracy was better than you could expect from any full-sized 9mm pistol. At pistol distances, the gun shoots consistently. We had no problem connecting with 2 inch targets. And the light recoil means fast split times. Double taps are incredibly easy, and the point of impact only moves a couple of inches. A lighter trigger would make it even better.<\/p>\n

Problems<\/h2>\n

We\u2019re committed to reviewing guns honestly at GunsAmerica, and do our best to fairly document any issues we have with guns. When we first shot the CMMG, we had some strange jams. The rounds were coming off of the magazine and jamming into the top of the chamber. It happened once or twice a magazine and was a royal pain in the ass to clear, as the next round would be pining the errant round and the magazine into the gun. I was using Fort Mill 115 grain ball ammo for the initial review and that was what was jamming. The Fort Mill didn\u2019t jam in any of the other 9mms I had. I could get other ammo to run reliably in the CMMG, but didn’t have enough of anything else on hand to test for reliability. The Fort Mill would jam into the chamber so hard that it would knock the bullet slightly to one side and bend the case.<\/p>\n

\"CMMG\"<\/a>

We did experience some strange jams. After swapping out the feed ramp, the problem vanished.<\/p><\/div>\n

I shoot a lot of guns, and I\u2019ve never had this issue with anything. I called CMMG and they worked me through it. Their first thought was that it had something to do with the feed ramp. They sent out a new one and I made the switch.<\/p>\n

I\u2019m not convinced that the feed ramp was at fault. At the end of the review, I\u2019m convinced it had something to do with this particular ammo in this particular gun. After isolating the Fort Mill, and swapping out the feed ramp, I was able to get the Mk9 to run magazine after magazine of everything. JHP, +P, steel case\u2014the Mk9 didn\u2019t care. And here\u2019s the important part. When I called CMMG to ask about the problem, they immediately went into action. They were vigilant about following up with the fix, too. They provided excellent customer service and the pistol ended up functioning exactly as I\u2019d thought it would. Can\u2019t beat that.<\/p>\n

\"CMMG\"<\/a>

There’s no gas system on the Mk9, so the guard doesn’t heat up much at all.<\/p><\/div>\n

Conclusions<\/h2>\n

All told, our experience with the CMMG couldn\u2019t have been better unless we\u2019d been able to magically anticipate the Fort Mill hang-ups. Once we had that cleared up, the Mk9 ran flawlessly. On a single point, with a nice pistol at your side (or a shotgun on the other side) the Mk9 becomes part of a great working combination. While it doubles up on much of the CQB work of a carbine, it does it in a more controlled manner than a typical 5.56. The 9mm may not offer the same terminal ballistics, but it isn\u2019t as susceptible to over-penetration, either.<\/p>\n

The more I get into these guns, the more I am convinced that the compact AR platform is the optimal choice for personal defense. In .300 AAC, and silenced, the platform would offer even more possibilities. Take some time and check out what CMMG is doing. You\u2019ll like what you see.\u00a0 MSRP on the Mk9 is $1,099.95. Considering the cost of some of the more functional 9mm pistols on the market, that’s pretty good.\u00a0 And you won’t have to worry about holsters.<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

The CMMG Mk9 PDW has an actual feed ramp for guiding troublesome rounds into the chamber.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The CMMG is fast. There’s no muzzle rise, as this photo illustrates.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

You can stabilize the back end with a sling, but it still won’t offer as much support as a stock.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

CMMG is using Magpul grips and trigger guards.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

With the optic out a bit further than normal, you can tuck the buffer tube into your shoulder like a stock.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The whole package is light enough that it can be held one handed. Barely.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

The magazine is easy to insert and to pull, and it is built like a tank.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The key-mod handguard fits well in the hand and weighs nothing.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

The Mk9 has a fat deflector that kicks shells out perpendicular to the receiver.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The Mk9 has a forward assist in the event that you do need some extra leverage to get the bolt home.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

Many of the features are typical to CMMG’s line of MSRs.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The mag well is beveled and mags move in and out easily.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

From this side, the Mk9 looks like a typical MSR.<\/p><\/div>\n

[\/one_half]<\/p>\n

[one_half_last]<\/p>\n

\"CMMG\"<\/a>

The Mk9 comes with an ambidextrous sling mount.<\/p><\/div>\n

[\/one_half_last]<\/p>\n

[one_half]<\/p>\n

\"CMMG\"<\/a>

The buffer tube fits tightly in the Sig brace, but it is long enough to shoulder without it.<\/p><\/div>\n

[\/one_half]<\/p>\n","protected":false},"excerpt":{"rendered":"

The CMMG Mk9 PDW is one of those guns often defined by what it is not. It is not a modern sporting rifle, exactly. It isn\u2019t a 5.56. It is not a traditional AR pistol (if such a thing exists). But if you\u2019re looking for something larger, faster, and more stable than a full-sized pistol, the Mk9 may be for you. If you are looking for something smaller and less powerful than an AR carbine, the Mk9 is an ideal choice. Not quite a carbine, more than a pistol: the Mk9 shines.<\/p>\n","protected":false},"author":18,"featured_media":22015,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_specdata_upc":"","_specdata_placement":"","footnotes":""},"categories":[92,36],"tags":[132,107,108,620],"featured":[],"hunt365":[],"class_list":{"0":"post-22000","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-david-higginbotham","8":"category-reviews-pistols","9":"tag-buzz","10":"tag-featured-articles","11":"tag-guns","12":"tag-tactical"},"yoast_head":"\nCMMG's 9mm Mk9, an ideal PDW--Gun Review<\/title>\n<meta name=\"description\" content=\"The CMMG Mk9 is a functional 9mm AR pistol, but it can do so much more. 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Not quite a carbine, more than a pistol: the Mk9 shines.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gunsamerica.com\/digest\/cmmg-9mm\/\" \/>\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=\"2014-07-18T18:02:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-28T19:03:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gunsamerica.com\/digest\/wp-content\/uploads\/2014\/07\/cmmg-20.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Dave Higginbotham\" \/>\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=\"Dave Higginbotham\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/\"},\"author\":{\"name\":\"Dave Higginbotham\",\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/#\\\/schema\\\/person\\\/4297e0be17b42d4988e700442f99cf5f\"},\"headline\":\"CMMG’s 9mm Mk9, an ideal PDW–Gun Review\",\"datePublished\":\"2014-07-18T18:02:20+00:00\",\"dateModified\":\"2026-01-28T19:03:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/\"},\"wordCount\":2163,\"commentCount\":15,\"publisher\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/wp-content\\\/uploads\\\/2014\\\/07\\\/cmmg-20.jpg\",\"keywords\":[\"Buzz\",\"Featured Articles\",\"Guns\",\"Tactical\"],\"articleSection\":[\"David Higginbotham\",\"Pistols\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/\",\"url\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/\",\"name\":\"CMMG's 9mm Mk9, an ideal PDW--Gun Review\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/cmmg-9mm\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gunsamerica.com\\\/digest\\\/wp-content\\\/uploads\\\/2014\\\/07\\\/cmmg-20.jpg\",\"datePublished\":\"2014-07-18T18:02:20+00:00\",\"dateModified\":\"2026-01-28T19:03:44+00:00\",\"description\":\"The CMMG Mk9 is a functional 9mm AR pistol, but it can do so much more. 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The performance of the Mk9 puts it in line with much bigger carbines.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/gunsamerica.com\/digest\/cmmg-9mm\/","og_locale":"en_US","og_type":"article","og_title":"CMMG's 9mm Mk9, an ideal PDW--Gun Review","og_description":"The CMMG Mk9 PDW is one of those guns often defined by what it is not. It is not a modern sporting rifle, exactly. It isn\u2019t a 5.56. It is not a traditional AR pistol (if such a thing exists). But if you\u2019re looking for something larger, faster, and more stable than a full-sized pistol, the Mk9 may be for you. If you are looking for something smaller and less powerful than an AR carbine, the Mk9 is an ideal choice. 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