Engineered for high-volume shooting and extra durability, our Tac Pro includes enhanced features: all-metal construction; quick 2-pin take down; rear-mounted buffer spring for reliable cycling at high temperatures; unique hybrid gas/inertial action for reliable cycling with a wide range of loads and under heavy use. Adjustable, flip up front and rear sights; quad Picatinny rail; adjustable comb; sling attachment points. Ships in hard case with 2- and 5- shell magazines. Barrel is threaded for Beretta Mobile Chokes, and ships with IC tube installed, (Additional tubes available on this site and from after-market manufacturers)Note: in accordance with ATF import restrictions, butt stock is fixed-position. Magazines guaranteed compatible with Rock Island Armory VR80, VR60, VRBP-100, Panzer Arms AR-12, AR-12 PRO and BP-12, MKA 1919, BR-99 and FR-98/99 Shotguns.