CMMG Debuts the MkG-45 GUARD, an AR15 Rifle Chambered in .45 ACP [VIDEO]



CMMG Inc. has announced something very new and exciting for the Pistol Caliber Carbine (PCC) market, an AR-15 platform rifle in .45 ACP. In a world where most PCC's are chambered in 9mm Luger, this one is a game changer.

It is a from-the-ground-up all-new design with a unique rotating bolt, radial delayed blowback action. The bolt carrier group looks much like a standard BCG, except that the bolt head lugs have a slight slope where they lockup with the barrel extension causing the bolt to rotate on recoil initially caused by the firing of the round. This means that the bolt and chamber stay locked up until pressures have been reduced to safe levels before the casing is removed from the chamber.

The bolt and bolt carrier group are also weight-reduced for less reciprocating mass which should result in a smooth, low-recoil, flat-shooting rifle. A standard drop-in trigger kit from many popular manufacturers can be used for full customization in the end-users trigger control experience.

The barrel is threaded to accept .45 caliber suppressors, which on the PDW model of the rifle, a short-barreled (SBR) NFA-controlled rifle would make for a quiet, nice-sized compact shooting option. Also with the recent clarification letter from the ATF on SB Tactical-style arm braces like the Sig Brace, one the pistol models could be a pretty slick option for those of your that don't want to go through the whole tax stamp process.

It also features a new patent pending dual-pinned, fully machined bolt catch linkage, making operation of the rifle both easy and intuitive. This is really key as many PCC's feature controls that are distinctly different from your standard AR.

Price varies by model of course, but for the MkG-45 PDW model MSRP is $1,349.95. CMMG also states that the rifle should be shipping out in mid-June, so a relatively short wait time means this compact defensive rifle can be in your hands soon!

Here are the technical specs (for the MkG-45 PDW):

Barrel: 8” 1:16 Twist, Medium Taper 4140 SBN Barrel
Muzzle: CMMG SV Brake, Threaded .578-28
Handguard: CMMG RKM7
Furniture: Magpul MOE Pistol Grip, Magpul MOE stock with 6-pos mil-spec receiver extension
Receivers: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
Trigger: CMMG Single Stage Mil-Spec style trigger
Weight: 5 lbs (Unloaded)
Length: 25 inches (Stock Collapsed)

You can see the whole line-up on CMMG Inc's website

About Riley Bowman

Riley Bowman is the Director of Training at and the Host of the Concealed Carry Podcast. He came up in this world initially through his 8-year experience with a state-level law enforcement agency in Colorado. Riley has trained extensively under instructors such as: Rob Leatham, Mike Seeklander, Tim Herron, Scott Jedlinski, Matt Little, Kyle Lamb, Dave Spaulding, Jeff Gonzales, Bill Blowers, Chuck Pressburg, and others, amassing many hundreds of hours of formal shooting and tactics training. He is an NRA Pistol Instructor, a Colorado P.O.S.T. Handgun and Patrol Rifle Instructor, a graduate of Trident Concepts Concealed Carry Instructor course, and a Modern Samurai Project Endorsed Instructor. He also competes in USPSA and 3-gun competitions including numerous top-10 finishes at major matches and championships. He is the current USPSA Carry Optics Colorado State Champion and most recently won 3rd place in Master Class at the 2022 USPSA Carry Optics National Championship.


  1. Larry on December 4, 2017 at 9:38 pm

    What kind of mags does this take? Glock , Colt??

  2. gle n on March 22, 2018 at 4:36 pm


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