A must have item for properly installing any muzzle device that you intend to use with a suppressor.  Proper alignment is key to helping prevent baffle strikes and this kit allow you to have precision shims to keep everything aligned as well as properly postion (clock/time) your muzzle device correctly.

Technical specs

12 pieces total one beveled spacer to ensure the muzzle device has a square shoulder to rest on and 11 varying thickness shims.  Also includes a small tube of Rocksett to secure the muzzle device in place.  PN Z-71652

OD .700″ ID .510″