The BANISH Tri-Lug Housing Assembly contains a BANISH 45 Tri-Lug piston cap, Shuttle Adapter, and Spring for use mounting a BANISH 45 to a three-lug, fixed barrel carbine. Pistol-caliber carbines are growing in popularity and for those with a three-lug mount, these adapters will allow you to mount your BANISH 45 suppressor. The BANISH Tri-Lug Housing Assembly contains a BANISH 45 Tri-Lug piston cap, Shuttle Adapter, and Spring. This assembly is directly compatible with the BANISH 45 and can be compatible with the BANISH 46 when used along with a BANISH 46 Piston Housing (sold separately).The Housing Assembly does not come with the Tri-Lug Mount Adapters that connect to the firearm. Those are caliber specific depending upon whether your carbine is a 9mm or a .45. When installed, the adapter gives you Quick-Attach Mounting Options for guns with fixed barrels.Silencer Central does not guarantee the housing assembly will work with other manufacturers'tri-lug barrels, including HK, B&T, ...