All the classic details of the time honored original are reproduced in today's semi-auto thompson 1927-a1.This.45 caliber carbine features a 16.5" finned barrel and genuine american walnut woodwork.It has a blade front sight with an open rear adjustable sight.This lightweight deluxe semi-auto model has a pinned compensator for an 18" barrel length.The frame and receiver are machined from a solid billet of aluminum with a blued metal finish, and a fixed buttstock, pistol grip and vertical foregrip.It includes one 20-round stick magazine.Metal Finish: BluedAction: Semi-AutoCaliber: 45 ACPBarrel Length: 16.50"Capacity: 20+1Safety: LeverOal: 41"Weight: 9.50 lbsStock Description: American WalnutMuzzle: CompensatorReceiver Material: AluminumSights: Blade Front, Fixed Battle RearBarrel Description: FinnedBarrel Length Range: 16" to 16.99"Weight Range: 9 lbs to 9.99 lbsHand: RightStock Finish Group: Brown/TanMetal Finish Group: Blued/Black