Paintball Barrels A5 Threads Empire Apex 2 Tippmann BT4 System 18" Inch - Black Ship from USA , Arrive 5-10 days Adjustable ramp switch for desired level of curve Curve your shot to hit "unreachable" targets Durable aluminum construction Tool-less dis-assembly for easy maintenance Left and Right Hook, Drop Shot, and Long Flat Trajectory Shots with the twist of the barrel (Refer to our images for diagram!)