CMMG Announces MkG45 AR-15 Rifle

by
posted on April 25, 2017
cmmg_guard_lede.jpg

CMMG has announced the release of the MkG45 Guard, a new AR-15 rifle chambered in .45 ACP, fed from Glock magazines. The Guard is offered in five different configurations, and operates on CMMG’s new, patent-pending Radial Delayed Blowback system.

“We set out to engineer an affordable, highly reliable AR chambered in .45 ACP that would use the widely available Glock magazines,” said Chris Reinkemeyer, CEO/CFO at CMMG. “In the early stages of design, we tested out a variety of different operating systems, including straight blowback and direct impingement, but none of those options gave us the reliability we were looking for. We ultimately came up with the design for the Radial Delayed Blowback system and from there, all the pieces started falling into place.”

While the straight blowback system found on most pistol-caliber AR carbines utilizes a non-rotating bolt assembly, the Radial Delayed Blowback system used on the Guard has a bolt carrier group (BCG) that appears similar to that found on a direct-impingement AR-15 but operates completely differently. The rotating bolt is the key to the Radial Delayed Blowback system. It is the act of the bolt being forced to rotate and unlock that slows down the BCG just enough to safely cycle .45 ACP while keeping the BCG and buffer lighter than 9 mm AR-15’s.

Some advantages that result from this new operating system are that it reduces the overall weight of the rifle and simultaneously decreases the felt recoil by using a lighter bolt and buffer. It also opens up the door to run calibers that have historically been too powerful for straight blowback but weren’t suited for direct impingement.

CMMG also put a high emphasis on having fully functional AR-15 controls, including last round hold open. The Guard features an all new patent-pending dual-pinned, fully machined bolt catch linkage. This linkage provides consistent and reliable operation straight out of the box with no need for adjustments or fine tuning. The actuation from this linkage is robust enough that it still uses a standard bolt catch spring.

The MkG45 Guard comes with one 13-round factory Glock 21 magazine. For optimal reliability, CMMG recommends using factory double-stack Glock .45 ACP magazines. Bolt weight kits will be sold separately for those who wish to fine-tune the Guard for +P ammunition or suppressor usage.

The CMMG MkG45 GUARD is available in the following configurations:

MkG45 Guard T:
Barrel:
16.1” 1:16 Twist, Medium Taper 4140 SBN Barrel
Muzzle: CMMG SV Brake, Threaded .578-28
Handguard: CMMG RKM11
Furniture: A2 Pistol Grip, M4 butt 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: 5.6 lbs (UNLOADED)
Length: 32.5 (STOCK COLLAPSED)
MSRP: $1299.95

MkG45 Guard DRB:
Barrel:
16.1” 1:16 Twist, Medium Taper 4140 SBN Barrel
Muzzle: CMMG SV Brake, Threaded .578-28
Handguard: CMMG RKM14
Furniture: Magpul MOE Pistol Grip, Magpul CTR 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: 5.8 lbs (UNLOADED)
Length: 32.5 (STOCK COLLAPSED) 
MSRP: $1399.95

MkG45 GUARD 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 (STOCK COLLAPSED)
MSRP: $1349.95

MkG45 Guard PDW Pistol:
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, CMMG Pistol receiver extension
Receivers: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
Trigger: CMMG Single Stage Mil-Spec style trigger
Weight: 4.7 lbs (UNLOADED)
Length: 24" (STOCK COLLAPSED
MSRP: $1299.95

MkG45 Guard DRB2:
Barrel:
16.1” 1:16 Twist, Medium Taper 4140 SBN Barrel
Muzzle: CMMG SV Brake, Threaded .578-28
Handguard: CMMG RKM14
Furniture: Magpul MOE Pistol Grip, Magpul CTR stock with 6-pos mil-spec receiver extension
Receivers: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
Trigger: Giessele Automatics SSA
Weight: 5.8 lbs (UNLOADED)
Length: 32.5 (STOCK COLLAPSED)
MSRP: $1599.95

 

 

Latest

TangoDown Light Portal Front Sight
TangoDown Light Portal Front Sight

Preview: TangoDown Light Portal Front Sight

Due to their location on the gun, most front iron sights preclude the placement of a tactical light forward on a defensive carbine’s 12-o’clock rail, as they typically obstruct the light’s beam.

Holiday Gift Guide: Specialty Knives, Hand Axes & Multi-Tools

While smaller blades can be plenty helpful for everyday carry, sometimes bigger blades and tools are necessary. Here are a few larger specialty knives, hand axes, and multi-tools worth keeping in mind as the holiday season approaches.

NRA Gun Of The Week: KelTec P15

Watch American Rifleman staff on the range this week with the KelTec P15, the company’s first striker-fired handgun and also one of the thinnest 9 mm Luger concealed-carry pistols to ever hit the market.

The Armed Citizen® Nov. 25, 2022

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Hodgdon Powder Celebrates 75 Years

This year, Hodgdon Powder celebrates its 75th year in business, having grown from humble origins in 1947.

Handloads: Hunting With The .375 Winchester

Although it is often difficult to find components for reloading the .375 Winchester cartridge, this lever-action round is deserving of customization for hunting in today's game fields.

Interests



Get the best of American Rifleman delivered to your inbox.