Adjustable low profile blank adapter for the M1 Garand. Replaces the gas cylinder lock for maximum strength and safety. Precision CNC machined out of tool steel and heat treated for strength and durability. Lathe turned threads for maximum hold on used USGI M1 Garand barrels. Comes with 3 hardened aperture screws for tuning to blanks of your choice for flawless performance. Finished in a flat black dulite type bluing.