The thompson 1927-a1 has a pinned cutts compensator, which lengthens the finned barrel length to 18", and puts the overall length for the carbine at 41" 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.Action: Semi-AutoCaliber: 45 ACPBarrel Length: 18"Capacity: 20+1Oal: 41"Weight: 13 lbsStock Description: Removable FixedReceiver Material: SteelSights: Blade Front, Adjustable RearBarrel Length Range: 18" to 18.99"Weight Range: 13 lbs to 13.99 lbsHand: RightStock Finish Group: BrownMetal Finish Group: Blued/Black