The 3-Lug Mount is a quick-attach mounting option for guns with fixed barrels.It is compatible with the following SilencerCo suppressors:Octane seriesOmega 9KOmega 45KHybrid 46Hybrid 46M (Requires AC4751)Omega 36M (Requires AC4751)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; the 9mm must only be used with 9mm 3-Lug Devices.