Wilson Combat Gas Tube Pistol Length. Excellent for upgrading a worn part or completing a custom build. Make sure you select the appropriate gas tube for your barrel. Pin not included; Length of the Pistol Gas Tube measures 6.625".; Specifications for Wilson Combat Gas Tube: Manufacturer: Wilson Combat Color: Silver Finish: Stainless Fabric/Material: Steel Gun Model: M16 AR-15 Condition: New Package Contents: Wilson Combat Gas Tube What firearm models does the manufacturer say Wilson Combat Gas Tube is compatible with? The manufacturer suggests that Wilson Combat Gas Tube is compatible with AR-15 M16Wilson Combat TR-GTP: Gas Tube Pistol Length