CMMG BBL AND BCG KIT 5 5.7X28MM

The CMMG BBL and BCG Kit 5 5.7x28mm offers a high-quality barrel and bolt carrier group designed specifically for AR-style rifles chambered in 5.7x28mm. This kit features a 5-inch barrel optimized for use with CMMG’s patented Radial Delayed Blowback system, which enhances cycling efficiency and reduces felt recoil compared to traditional direct blowback designs. The bolt carrier group is engineered to be lightweight while maintaining reliable function, including last-round bolt hold open capability.

Designed for compatibility with Mk4 and mil-spec AR15 upper receivers, this kit also integrates seamlessly with CMMG Mk57 or standard AR15 lower receivers when paired with the appropriate 5.7x28mm magazines. The CMMG BBL and BCG Kit provides a streamlined solution for builders looking to assemble a compact AR pistol or short-barreled rifle chambered in this unique caliber. Its black finish complements the tactical aesthetics of modern AR platforms while ensuring durability and corrosion resistance.