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CMMG Releases The Mk57 GUARD Chambered In FN 5.7×28

Boonville, MO (7-24-18) – CMMG has announced the release of a new line of AR pistols and short-barreled rifles (SBR’s) chambered in FN 5.7x28mm. Available in 5-inch barreled BANSHEE and 8-inch barreled PSB configurations, each model in the new Mk57 GUARD line is fed from FN 5.7 pistol magazines and uses CMMG’s patent-pending Radial Delayed Blowback operating system.

“The 5.7 is an intriguing round that is perhaps best known for its relatively lightweight bullet design and impressive velocities. From an engineering perspective, we were excited to pair the 5.7 with our Radial Delayed Blowback system. I think it’s safe to say that this combination makes the Mk57 one of the lightest recoiling pistol caliber carbines on the market,” said Chris Reinkemeyer, CEO of CMMG.

At the heart of the Mk57 is CMMG’s Radial Delayed Blowback operating system designed to minimize felt recoil. It features rotating bolt that requires the recoil impulse of a round being fired in order to unlock. As each round is fired, a portion of the rearward force is exhausted in unlocking this bolt prior to driving the carrier rearward and cycling the action. With less rearward force to compensate for, CMMG is able to use a lighter carrier and buffer than a standard blowback design would allow, thus reducing the overall reciprocating mass.

CMMG will also offer a separate lightweight buffer for use with subsonic ammunition. To overcome the reduced backpressure with subsonic loads, the lightweight buffer can help ensure that the bolt locks back after firing the last round.

The FN 5.7×28 was designed and introduced by FN Herstal with the intention of replacing the 9mm for military and law enforcement usage. While the caliber has been adopted by several agencies throughout the world, its real success came with its entry into the civilian market in the early 2000’s.

Mk57 BANSHEE

The BANSHEE in 5.7×28 has a 5-inch barrel and comes as either an SBR or an AR pistol. The SBR version is sold with Magpul Moe vertical foregrip and features CMMG’s new RipStock. The Ripstock allows users to quickly deploy the stock to an extended position without having to actuate a release lever. It also has five set-screw positions that allow users to customize the length of extension to the best fit. The AR pistol versions come with a Gear Head Works Tailhook Mod2 brace that allows users to easily extend/collapse the brace with the press of a button.

Distinguishing features of the BANSHEE also include the addition of CMMG’s new ambidextrous charging handle and RML4 M-LOK hand guard. A CMMG Premier Cerakote finish (11 different colors to choose from) is included standard with each BANSHEE. It ships with one 20-round ProMag magazine and is compatible with FN Five-SeveN pistol magazines.

Mk57 BANSHEE 5.7x28mm SBR

BARREL: 5″ MT 4140CM SBN, 1:9 Twist
MUZZLE: Thread Protector, Threaded ½-28
BCG WEIGHT: 9.9 oz.
HAND GUARD: CMMG RML4
FURNITURE: Magpul MOE Pistol Grip, Compact Receiver Extension, CMMG RipStock, Magpul MVG Foregrip, Fully Ambidextrous Sling Plate, Selector, and Charging Handle
RECEIVERS: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
TRIGGER: CMMG Single Stage Mil-Spec
MAGAZINE: 20-round ProMag
WEIGHT: 4.6 lbs (Unloaded)
LENGTH: 21.75″ (STOCK EXTENDED) 18.5″ (STOCK COLLAPSED)
MSRP: $1,549.95

Mk57 BANSHEE 5.7x28mm Pistol

BARREL: 5″ MT 4140CM SBN, 1:9 Twist
MUZZLE: Thread Protector, Threaded ½-28
BCG WEIGHT: 9.9 oz.
HAND GUARD: CMMG RML4
FURNITURE: Magpul MOE Pistol Grip, Gear Head Works Tailhook Mod 2 Brace, Fully Ambidextrous Sling Plate, Selector, and Charging Handle
RECEIVERS: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
TRIGGER: CMMG Single Stage Mil-Spec
MAGAZINE: 20-round ProMag
WEIGHT: 4.7 lbs (Unloaded)
LENGTH: 21.75″ (STOCK EXTENDED) 18.5″ (STOCK COLLAPSED)
MSRP: $1,549.95

Mk57 5.7x28mm PSB

The Mk57 PSB Pistol includes an 8-inch barrel and a KAK Shockwave Brace. It also sports a CMMG RML7 M-LOK hand guard and CMMG A2 Compensator. It ships with one 20-round ProMag magazine and is compatible with FN Five-SeveN pistol magazines.

Mk57 PSB 5.7x28mm Pistol
BARREL: 8″ MT 4140CM SBN, 1:9 Twist
MUZZLE: CMMG A2 Compensator, Threaded ½-28
BCG WEIGHT: 9.9 oz.
HAND GUARD: CMMG RML7
FURNITURE: Magpul MOE Pistol Grip, KAK Shockwave Stabilizer and Brace
RECEIVERS: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
TRIGGER: CMMG Single Stage Mil-Spec
MAGAZINE: 20-round ProMag
WEIGHT: 5 lbs (Unloaded)
LENGTH: 25″
MSRP: $1,399.95

Mk57 5.7x28mm Pistol

The Mk57 Pistol includes an 8-inch barrel and sports a CMMG RML7 M-LOK hand guard and CMMG A2 Compensator. It ships with one 20-round ProMag magazine and is compatible with FN Five-SeveN pistol magazines.

Mk57 PSB 5.7x28mm Pistol
BARREL: 8″ MT 4140CM SBN, 1:9 Twist
MUZZLE: CMMG A2 Compensator, Threaded ½-28
BCG WEIGHT: 9.9 oz.
HAND GUARD: CMMG RML7
FURNITURE: Magpul MOE Pistol Grip
RECEIVERS: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
TRIGGER: CMMG Single Stage Mil-Spec
MAGAZINE: 20-round ProMag
WEIGHT: 5 lbs (Unloaded)
LENGTH: 25″
MSRP: $1,349.95

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