This is a Bravo Company Compensator known as the Compensator chambered in 556NATO, model BCM-GFC-MOD-1-556.
Dual action brake minimizes side pressure and designed to have much less noise associated with typical compensators. Makes it perfect for working in teams for CQB. It is a compensator that is built for the 21st Century Gunfighter. Extended version of the BCMGUNFIGHTER MOD 0 - 5.56
Features:
Stainless Steel construction
Predrilled for permanent installation
Includes a Crush Washer
Threaded 1/2 x 28 for 5.56mm AR15 platforms