Rearden was founded with a simple mission: be great and innovate. They have never been one to back down from a challenge or say something cant be done. Cant is not a part of their vocabulary. The Atlas provides a mount interface for suppressors with inside diameter threading Bravo 1.375-24.Features :17-4 PH H900Compatible with All Rearden Muzzle DevicesCompatible with Q Cherry Bomb and Other Plan B Compatible Muzzle DevicesBlack Nitride Finish (67 HRC Surface Hardness)"1.500" Outside Diameter,Gives Extra Clearance for Two Port Brakes (DPB)