Gemtech Threaded Barrel Factory Sig 220 .45 ACP .578-28 TPI Out of stock. Check back later... $273.42
Gemtech, GM-45/Blackside Threaded Piston Adapter, .578 x 28 Short Thread Pitch, Fits Sig P220 Factory Threaded Barrel 12186 Out of stock. Check back later... $178.92