Give your rifle a little more accuracy with the Browning BOSS-CR A-Bolt Muzzle Brake. There are many advantages of Boss without a muzzle brake feature. It has a 1 piece no hole accessory that is designed to fit only Bar MK II's and A-bolt II's previously factory fitted with Boss. The CR stands for conventional recoil and gives the shooter the option of shooting the BOSS system with standard recoil and muzzle blast. Matte blued to match Browning A-Bolt models: Composite Stalker Hunter Euro-Bolt Varmint Eclipse Hunter and M-1000 Eclipse