HUXWRX PISTOL DIRECT THREAD ADAPTER Made from 17-4 Stainless Steel and is heat treated then black nitride finished for improved wear and corrosion resistance. This accessory is for use on fixed barrel systems. FEATURES: Interchangeable with suppressors that have 1.125x28 threads Wrench flats WARNING - NOT FOR USE ON UNLOCKING OR RECIPROCATING BARRELS AS IT MAY CAUSE DAMAGE TO THE SUPPRESSOR Mfg: Huxwrx