The CMMG Mk57 GUARD is a new AR15 chambered in 5.7X28mm. The Mk57 is fed from FN FiveSeven style magazines and uses CMMG’s patent pending Radial Delayed Blowback operating system that easily handles the 5.7X28mm cartridge while simultaneously keeping weight and felt recfoil to a minimum. It also features a new patented dual-pinned, fully machined bolt catch linkage, making operation both easy and intuitive. The Mk57 is threaded 1/2-28 to accept the most common 5.7 rated suppressors and is the perfect carbine for defending your home or enjoying a day at the range.
All CMMG firearms are designed to function with a wide variety of factory loaded ammunition and undergo rigorous testing prior to release to ensure reliability and durability. Because CMMG relies on factory ammunition for testing, we cannot guarantee reliable function with handloads or reloads. Warranty claims due to handloads or reloads will be subject to review.
Firearms may only be shipped to a licensed dealer (FFL Holder). Actual buyer must pick up from FFL dealer who will conduct the background check. Some listed items may not be legal in every state. We will not sell firearms to residents of CA or NY. Buyer assumes responsibility of knowing purchase laws in their state. You must be at least 18 years of age to purchase a rifle, and 21 years of age to purchase a handgun or receiver. A CMMG Representative will contact you after your order has been placed to facilitate the transfer.
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