HK Army HSTL Carbon Fiber HPA Compressed Air Paintball Tank System HK Army HSTL Carbon Fiber HPA Compressed Air Paintball Tank System. Tags: army, carbon, compressed, fiber, hstl, paintball, system, tank « Acecare 6.8L PCP Tank 4500psi dot Carbon Fiber Paintball Tank with Diving Valve Tuxing 4500psi High Pressure Composite Cylinder 9l Carbon Fiber Tank Diving Scuba Tank Pcp Paintb »