Dye Ultralite Boomstick Barrel Back .680 Autococker Black Dust airsoft and efficiency to a whole Gun Bags and efficiency to a whole new level (1) Front Bolt (1) Feeder Bolt (1) Banjo Fitting (1) 1 16" Hose 1" (1) Trigger Spring (1) Front Bolt O Ring (1) Valve Washer (5) Trigger Plate Pins (1) A 5 Barrel O Ring (3) Receiver Pins (1) Linkage Arm (1) Drive Spring (3) Receiver Nuts (1) Ratchet (1) Velocity Screw (1) CA 02B Nut (1) Trigger Return Spring (1) Piston U Cup (2) Rear Bolt O Rings (1) Ball Latch (2) Grip Screws (1) Valve O Ring (Large) (2) Receiver Bolts (Short) (1) Tank Valve O Ring (2) CA 02A Bolt BHCS (1) Sear Pin (1) Drive Pin (1) 1 4" Bolt 5 8" (4) Receiver Bolt (1) X7 Safety With Two Piece Construction you will have confidence knowing that every back and tip combination in your kit will be as straight and true as a one piece barrel design Precision quality shot after shot that you can expect form Dye as the leader in barrel manufacturing