CMMG Barrel and BCG Kit 4140CM SBN Drop in Barrel 5.7 x 28mm 5" Barrel Black

The CMMG Barrel and BCG Kit 4140CM SBN Drop-in Barrel 5.7 x 28mm 5" Barrel Black is designed for shooters and operators looking for a reliable conversion platform for their AR-15 rifles. This kit allows users to transition to the 5.7x28mm cartridge without the need for gunsmithing, providing immediate functionality.

Constructed from durable 4140CM steel, the 5" barrel length is optimized for velocity and accuracy, making it suitable for close-quarters battle (CQB) environments. The black nitride finish enhances corrosion resistance and durability, while the drop-in design ensures compatibility with standard AR-15 upper receivers and lower receivers.

This kit is ideal for law enforcement professionals, competitive shooters, and tactical operators who prioritize reduced recoil and flash signature. The included bolt carrier group is engineered to reliably cycle 5.7x28mm ammunition, making it a practical choice for noise-sensitive operations and indoor training scenarios.