This is an excellent condition Thompson Center Arms System 1 for sale chambered in .54 Caliber. The barrel length is 27 inches long with a removable taper-lock breech plug. The bore is in excellent condition. The bluing on the barrel and receiver are both in excellent condition. The stock is in excellent shape with some minor handling dings. The recoil pad is original and in great shape. Functionally this rifle works great but it has not been test fired.