MacDev Paintball Shift 2 Complete Autococker Threaded Barrel Kit - Includes: Tip, Back w/ Interchangeable Rubber Grip and 5 Inserts - Length: 14 Inch Barrel Thread: Autococker - Kit is compatible with all autococker threaded paintball guns including: MacDev, Empire, Dye, Planet Eclipse, Dangerous Power, Proto and more Overall Barrel Length: 14" | Available in Black and Silver Colorways | Optional interchangeable rubberized grip colors available Contents: (1) Barrel Tip, (1) Barrel Back, (5) Aluminum Inserts sized .677, .681, .685, .689, and .693 O-ring stabilization on barrel tip, barrel back and aluminum inserts to avoid movement and a precision fit Shift porting gives you the right balance between sound, accuracy and air efficiency