Wilson Combat Recoil Spring Plug Flat Cap Bullet Proof Blue. The end of the plug is left un-checkered for a sleek look that the; bushing / bushing wrench will not mar during assembly and/or disassembly. Recoil; Spring Plugs are easy to lose during disassembly and your gun won't run without; one so it's always good to have a spare on hand. Specifications for Wilson Combat Bullet Proof Commander Ringed Recoil Spring Plug: Manufacturer: Wilson Combat Fabric/Material: 316 Stainless Steel Quantity: 1 Package Contents: Wilson Combat Bullet Proof Recoil Spring Plug Wilson Combat 565B: Recoil Spring Plug Flat Cap Bullet Proof Blue