This adapter allows you to use your 1.125-28 threaded Alpha (also Harvester .300) pattern suppressor in direct thread configuration. Stainless mounts install/remove with a 12-point wrench/socket, pin wrench or hook type spanner wrench. The standard (short) version of the stainless mount has a 1/2″ deep threaded bore for most fixed barrel pistols and carbines, the long version has a .625″ threaded bore for AR length barrel tenons. All stainless versions are barrel shoulder register, including metric; these will NOT register on the muzzle.
The M13.5×1 LH Stainless mount has the 25° Sig taper
Stainless Alpha Direct Thread Mount specs:
External thread: 1.125-28
Installation and removal can be accomplished with several tools, including a pin wrench or spanner wrench, but 17-4 mounts are designed with a 1-1/16″ 12 point wrench or socket in mind.
|Alpha DT Muzzle Thread||
.578-28, 1/2-28, 1/2-36, 5/8-24, 5/8-32, M13 x .75, M13.5x1LH Sig Taper, M14x1LH, M15x1, M16x1LH, 11/16-24, Ultralight .578-28 Aluminum, Ultralight 1/2-28 Aluminum, Ultralight 9/16-24 Aluminum, Ultralight M13.5×1 LH Aluminum, Ultralight M16x1 LH Aluminum