The Alpha Atlas provides a mount interface for suppressors with inside diameter threading of 1.125-28, like the Rugged Obsidian 9 and Obsidian 45. This is not recommend on suppressors that use the low profile style adapters, like the Omega 9k.Features :17-4 PH H900Compatible with short Rearden devices (FHD, Mini, SPB, RPB, R2S)Compatible with Q Cherry Bomb, Other Plan B Compatible Muzzle DevicesNitride Finish