Gemtech .338 Tri-lug Quick Mount - 12142. 338lm Muzzle Brake For Arrow Qm Suppressor Threaded 3/4-24 Specifications for Gemtech Gemtch Tri-lock: Caliber: .338 Lapua Package Contents: Gemtech Gemtch Tri-lock The Gemtech Gemtch Tri-lock is a quality...