Wilson Combat Match-Grade Barrels are known for their unsurpassed quality and accuracy. Now you can have this superb accuracy without sending your pistol off to a master pistolsmith and waiting for months.Tactical Bushing-Less ProfileMatch-Grade - Superb Accuracy (2" Or Less At 25 Yards With Good Ammo)1 in 16" TwistFully Machined From Aircraft Grade Stainless Steel ForgingsHeat-Treated To R/C 40 For Maximum Service LifeCritical Manufacturing Tolerances Are Held To Less Than .0005" (One Half Thousandth Of An Inch!)Glass Smooth Chamber And Perfectly Concentric With The BoreIn Our Barrel Test Fixture We Routinely Obtain ½" At 25 Yard GroupsDetailed Final Inspection Prior To Receiving The Wilson Name On The HoodCritical Lock-Up Contact Areas Cut To A Dimension That Provides A Good Lock-Up In Most Colt And Springfield Armory Pistols; Wilson Combat Match-Grade Barrels are known for their unsurpassed quality and accuracy. Wilson Combat match barrels are fully machined from aircraft grade stainless steel forgings and heat-treated to R/C 40 for maximum service life. Critical manufacturing tolerances are held to less than .0005" (one half thousandth of an inch!). To give you phenomenal accuracy, extreme care has been taken to assure that the chamber is glass smooth and perfectly concentric with the bore. In our barrel test fixture we routinely obtain test groups of 1/2" @ 25 yards; the accuracy is guaranteed to please YOU! Throughout the manufacturing process each barrel undergoes multiple quality-control checks, with a detailed final inspection prior to receiving the Wilson name. You can be sure that if your barrel bears the Wilson name, it's the best there is!; Now you can have superb accuracy (2" or less at 25 yds. with good ammo) without sending your pistol off to a master pistolsmith and waiting for months. Our "drop-in" barrel is exactly the same as our #33G match grade barrel, with the critical lock-up contact areas cut to a dimension that provides a good lock-up in most Colt and Springfield pistols. Due to variations in pistol dimensions, installation in some pistols may require very minor material removal which most people can easily do themselves; Fits The Following Full-Size 1911 Handguns:AMT - Hardballer; Caspian - Government Model, Enhanced Government Model, Hi-Caps; Colt - Government Model, Gold Cup, Double EagleDetonics - ScoremasterEssexKimberMilitary IssueNorincoPara-Ordnance - P14Rock IslandRock RiverSafari Arms - MatchmasterSig Sauer - GSRSmith & WessonSpringfield ArmoryStrayer-Tripp-Voight - 2011TaurusWilson Combat; Specifications for Wilson Combat Full Size Tactical Drop-In Barrel: Manufacturer: Wilson Combat Finish: Stainless Caliber: .45 ACP Barrel Length: 5 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-16 Condition: New Package Contents: Wilson Combat Full Size Tactical Drop-In Barrel