Evolution Gun Works Commander Reverse Plug w/Short Inside Hole w/.332in Hole 1.7in Carbon Steel Blued Finish. 25"Hole Diameter:.332"Reverse Plugs from EGW are designed for easy installation and increased performance.Made from carbon steel (not lead alloy) to eliminate cracking the rounded shoulder is extended for added support with no exposed area where cracks can occur.A reverse plug is used in comp guns and bull barreled pistols where there is no bushing to retain the spring.Made for Commander slides. Available in Carbon Steel only. Must be installed by a competent gunsmith. Specifications for Evolution Gun Works Commander Reverse Plug Carbon Steel: Manufacturer: Evolution Gun Works Color: Black Finish: Blued Fabric/Material: Steel Gun Model: Colt 1911 Government Package Contents: Evolution Gun Works Commander Reverse Plug Carbon Steel What firearm models does the manufacturer say Evolution Gun Works Commander Reverse Plug Carbon Steel is compatible with? The manufacturer says that Evolution Gun Works Commander Reverse Plug Carbon Steel is compatible with Colt 1911 GovernmentEvolution Gun Works 12030: Commander Reverse Plug w/ Short Inside Hole w/ .332 in Hole 1.7 in Carbon Steel Blued Finish