The 3-Lug Mount is a quick-attach mounting option for guns with fixed barrels. The 3-Lug Mount must be used with a 3-Lug Muzzle Device. The 45 caliber 3-Lug Mount must be used only with 45 caliber 3-Lug Mount Muzzle Devices. SilencerCo's 45 caliber 3-Lug Mounts are made to B&T Spec. Compatible with the following SilencerCo suppressors: Omega K Series Spectre 9 Hybrid 46 (Requires Bravo Piston Mount) Hybrid 46M (Requires Charlie Piston Mount) Omega 36M (Requires Charlie Piston Mount) Alpha MAAD Brake Bravo MAAD Brake (Requires Bravo Piston Mount) Charlie MAAD Brake (Requires Charlie Piston Mount)