Gun Blue48 shows what he did to the Army Armament R613 Staccato XL... "I recently purchased the Army Armament R613 Staccato XL and noticed that the hop gasket was bent, which concerned me. Consequently, I attempted to replace the chamber and gasket. The parts used in this process included the GUARDER Hi-Capa Enhanced Chamber Set and Miyagawa Rubber's long silicone 50°. These parts are typically used in model guns, gas guns, and airsoft guns."