CMMG Barrel and BCG Kit 4140CM SBN Drop in Barrel 5.7 x 28mm 16.1" Barrel Black

The CMMG Barrel and BCG Kit 4140CM SBN Drop in Barrel 5.7 x 28mm 16.1" Barrel Black is designed for AR-platform carbines, providing a conversion solution specifically for those looking to utilize the 5.7×28mm cartridge. This kit includes a barrel and bolt carrier group, allowing for a straightforward installation without the need for precision fitting.

Featuring a 16.1-inch barrel made from 4140 chromoly steel, this kit utilizes CMMG's proprietary Radial Delayed Blowback operating system. This system enhances recoil management and offers bolt hold-open functionality, distinguishing it from traditional direct blowback designs. The black finish on both components provides corrosion resistance suitable for various environments.

Ideal for operators and enthusiasts, the 5.7×28mm platform offers intermediate ballistics with reduced recoil and a lower noise signature compared to 5.56 NATO. This kit maintains the familiar AR ergonomics, making it a practical choice for those engaged in confined-space work and vehicle operations.