CMMG 8" Barrel and BCG Kit for AR Rifles in 5.7x28mm

In the realm of firearms, precision and innovation are paramount. Enter the 8" 5.7x28mm Barrel and BCG Kit by CMMG—a masterstroke in firearm engineering designed for those who demand excellence in building an AR pistol or SBR chambered in 5.7x28mm.

At the heart of this kit lies CMMG's patented Radial Delayed Blowback operating system, a significant departure from conventional direct blowback systems. This advanced mechanism not only reduces the weight within your Bolt Carrier Group (BCG) but also mitigates felt recoil significantly more than its straight blowback counterparts. The result is a smoother shooting experience without sacrificing crucial features such as last round bolt hold open.

Designed with adaptability in mind, these barrel and bolt kits seamlessly integrate into a Mk4/mil-spec AR15 upper receiver setup. They offer versatility to work with either a CMMG Mk57 lower receiver or even a standard Mk4/AR15 mil-spec lower receiver when paired with CMMG's innovative 5.7 AR Conversion Magazines.

For those pursuing refined performance combined with reduced recoil dynamics, this offering stands as an exemplar of modern firearm design—crafted for enthusiasts who appreciate both form and function.