Auto Ordnance Thompson 1927A-1 45 Auto (ACP) American Walnut Semi Automatic Rifle - 18in - The Thompson 1927-A1 has a pinned Cutts compensator, which lengthens the finned barrel length to 18in, and puts the overall length for the carbine at 41in from buttstock to muzzle. It has a blade front and open rear adjustable sight. The fixed stock is crafted in luxurious polished American Walnut and has a vertical foregrip.