ATLAS BRAVO XL ADAPTER The Atlas Bravo XL provides a mount interface for suppressors with inside diameter threading 1.375-24. SPECIFICATIONS: Weight: 1.375a ^2-24: 2.17 oz Length Added: 1.0a ^2 Threads: 1.375a ^2-24 17-4 PH H900 Compatible with All Rearden Muzzle Devices Compatible with Q Cherry Bomb and Other Plan B Compatible Muzzle Devices Black Nitride Finish (67 HRC Surface Hardness) 1.500a ^2 Outside Diameter Gives Extra Clearance for Two Port Brakes Mfg: Rearden Manufacturing Group Llc