GEEKMAKER OUTDOOR STORE Store has All Kinds of CNC Processing Glock Block Frame Disassembly Tool, Barrel End Threaded Adapter 1 2-28 Adapter for Ruger .22 Mark I,II, III Bull W Thread Protector Ruger .22 Mark I 1 2x28 TPI, Barrel End Threaded Adapter For Plain BULL Barrels (.920) to Adapter 1 2x28 TPI - Black and more On Sale, Find the Best China 1 at.. Product Description. This premium Ruger 1022 Threaded Barrel Adapter quickly and easily slips on to the non-threaded barrel of your Ruger 1022. The largest diameter is a little larger than current A2 Birdcage and similar flash hiders. Once on the barrel, simply tighten the set screw, attach your own end-of-barrel accessory, and start shooting.