Bushmaster Snake Chamber II Muzzle Brake 450BM/350 Legend Black. This muzzle device has been designed to significantly reduce felt recoil and sharpen the accuracy of the fired round. This amazing new muzzle device is the perfect addition to any barrel with a thread pitch of 11/16 x 24. Don't wait to try this new Bushmaster product out on your next hunt. Specifications for Bushmaster Snake Chamber II Muzzle Brake: Manufacturer: Bushmaster Color: Black Caliber: .350 Legend .450 Bushmaster Threads per Inch: 11/16x24 Gun Make: AR Platform Condition: New Package Contents: Bushmaster Snake Chamber II Muzzle Brake Bushmaster 00-51012-BLK: Snake Chamber II Muzzle Brake 450BM/350 Legend Black