CMMG 5.7x28mm 8" AR-15 Barrel and BCG Kit 1:9 Twist Nitride

The CMMG 5.7x28mm 8-inch AR-15 Barrel and BCG Kit is a semi-automatic conversion package for building an AR-style rifle chambered in 5.7x28mm. The kit includes a barrel and bolt carrier group sold together as a bundle, with a black nitride finish on a 4140 chrome moly steel barrel.

The bolt carrier group uses CMMG's patented Radial Delayed Blowback operating system. According to the manufacturer, this design reduces the weight of the bolt carrier group and produces less felt recoil than a straight blowback system. The barrel has a 1:9 twist rate and an 8-inch length.

The kit is designed for use with a CMMG Mk57 lower receiver or a standard AR-15 lower receiver when paired with CMMG 5.7 AR conversion magazines.

• Caliber: 5.7x28mm
• Barrel Length: 8 inches
• Twist Rate: 1:9
• Material: 4140 Chrome Moly Steel
• Finish: Nitride
• Color: Black
• Action: Semi-Auto
• Platform: AR-15