The UnderTaker Plus Sighted Choke System is specifically designed for the turkey hunter. The instructions state that this will fit any Benelli or Bereta 12 ga. Shotgun. New in package. You can adjust vertical and horizontal point of aim using one of the 3 different height fiber optic sight rings. Horizontal adjustment is made by screwing and locking the sight to the right or left as needed to make your Turkey gun shoot right on point of aim. This is a model 00673 -.665: Inside Diameter. The choke tube sticks out about a 3/4 inch from the end of the barrel and has a knurled end for easy removal without tools (assuming you lubricate it before you install it). This kit retailed for $49.95, and the choke tube w/o the sighting system is $19.95. Shipping is $5.20 priority mail.