Thompson Thompson 45 Automatic Colt Pistol ACP 10 Round Drum Black Finish. The impressive look and feel of the drum magazines are unsurpassable. Each authentic drum is entirely U.S. manufactured to the exact specifications as the originals. The 10 Round. and 50 Round. drums have a diameter of 6.75". The 100 Round. durm has a diameter of 8.75". Each drum is shipped with a drum installation device (3 Round hand) and a Thompson manual. It works in most full auto models. Specifications for Thompson T12BKT Thompson 45 Automatic Colt Pistol (ACP) 10 Round Drum Black Finish: Manufacturer: Kahr Finish: Black Fabric/Material: Steel Magazine Capacity: 10 Round Caliber: .45 ACP Gun Make: Thompson/Center Arms Gun Model: Thompson Model 1927A1 The Thompson T12BKT Thompson 45 Automatic Colt Pistol (ACP) 10 Round Drum Black Finish is a quality addition to the Kahr lineup. For more great deals on Rifle Magazines by Kahr please browse our Kahr Magazines page. What firearm models does the manufacturer say Thompson T12BKT Thompson 45 Automatic Colt Pistol (ACP) 10 Round Drum Black Finish is compatible with? The manufacturer says that Thompson T12BKT Thompson 45 Automatic Colt Pistol (ACP) 10 Round Drum Black Finish is compatible with Thompson Model 1927A1