Nighthawk Custom Thick 1911 Bushing and Smooth Recoil Spring Plug Govt. Stainless. This bushing is designed for use with .580" O.D. barrels with the I.D. and O.D. left slightly oversized for custom gunsmith fitting to your barrel further ensuring precise lockup and improved accuracy. Whether you're piecing together your dream 1911 build or breathing new life into your stock pistol Nighthawk Customs FM Series parts provide the performance and service life our customers have come to expect. Gunsmith fitting may be required The Nighthawk Custom line of Fully Machined parts are designed to be the gold standard in the 1911 parts industry. All Fully Machined parts have been fully CNC machined from solid steel billets. We never use cast metal injected moldings or polymer parts. In order to create the Worlds Finest 1911s only the best materials can be used. That is why you can trust Nighthawk Custom Fully Machined parts in your 1911. Specifications for Nighthawk Custom Thick 1911 Bushing and Smooth Recoil Spring Plug: Manufacturer: Nighthawk Custom Color: Stainless Fabric/Material: Stainless Steel Package Contents: Nighthawk Custom Thick 1911 Bushing and Smooth Recoil Spring Plug Nighthawk Custom KT01050: Thick 1911 Bushing and Smooth Recoil Spring Plug Govt. Stainless