You must ship your upper for free piston installation during this time we check headspace, and test fire with Wolf or Tula Ammo.
Black Rifle Arms® AR-15 5.56x45 Low Profile Mid Length Piston Conversion with 12.37" Samson Evolution Rail. System components made from the highest quality available. Gas Block journal diameter of .750" or 3/4" and at least 1.9" length at the shoulder.
WE CAN NOT REMOVE PERMANENTLY ATTACHED MUZZLE DEVICES
Must ship your complete upper with bolt, cam pin, firing pin, retaining pin, and charging handle. Please removed carrier, gas block, and DI handguards.
Conversion Kit Includes: