CMMG AR-15 Bolt Carrier Group 6.5 Grendel/6mm ARC Black

The CMMG AR-15 Bolt Carrier Group is purpose-built for standard AR-15 platform firearms chambered in 6.5 Grendel or 6mm ARC, and is also compatible with 22 ARC uppers. This complete BCG drops right into your build, giving you a reliable, factory-engineered carrier group for the longer, high-ballistic-coefficient intermediate cartridges in the AR-15 family.

The bolt is precision-machined from 9310 steel and finished in phosphate for excellent surface hardness, wear resistance, and lubricity. The carrier is forged from 8620 steel and chrome-lined for long-term durability, then finished in matching black phosphate. Together, this proven material combination delivers the strength needed to handle Grendel-class pressures while maintaining smooth, consistent cycling in your AR-15.

CMMG designed this bolt carrier group specifically for the standard AR-15 platform; it is not compatible with the CMMG MkW platform. Whether you are building a new 6.5 Grendel or 6mm ARC upper, refreshing a worn assembly, or assembling a precision AR build, this CMMG BCG provides the quality and reliability CMMG is known for.