Griffin Armament Ta1515824 5/8X24 Thread Adapter 5/8"X24 Black These Suppressor Thread adapters Allows User To Convert AK-47 Style 14X1mm LH And HK Style 15X1mm RH Threaded muzzles To Receive 5/8X24 Threaded Accessories. These Surplus Rifle Threads Require a Muzzle Face Index For Perpendicularity, Making Them incompatible With Muzzle devices That Require Timing.