CMMG 16.1" 5.7x28mm Barrel and BCG Kit Black for AR Rifles

The 16.1" 5.7x28mm Barrel and BCG Kit is designed for building a 5.7x28mm AR-platform firearm utilizing the patented Radial Delayed Blowback operating system. This system helps reduce bolt carrier group weight while delivering less felt recoil compared to traditional straight blowback designs. The kit is engineered for use with Mk4/mil-spec AR15 upper receivers and is compatible with either Mk57 lower receivers or standard Mk4/AR15 mil-spec lower receivers when paired with 5.7 AR Conversion Magazines. Finished in black, this kit provides a complete barrel and bolt carrier group solution for 5.7x28mm AR builds.

Product Features

• Chambered in 5.7x28mm.
• Includes 16.1-inch barrel and bolt carrier group.
• Utilizes patented Radial Delayed Blowback operating system.
• Reduced felt recoil compared to traditional straight blowback systems.
• Supports last round bolt hold open functionality.
• Designed for Mk4/mil-spec AR15 upper receivers.
• Compatible with Mk57 lower receivers.
• Compatible with AR15 mil-spec lower receivers when used with 5.7 AR Conversion Magazines.
• Black finish.