If you have a leak from the LPR set screw, then one of the outer LPR orings near the set screw is bad. It may not look bad but swap them out anyway.
A leaky LPR will not be able to maintain enough pressure to cycle the gun.
Make sure you don't have the front on/off knob in the off position as well.
CCI stock class Phantom pump f/s. This thing is LNIB. Comes with stock magazine, extended magazine, barrel detent kit, crossfire lite up dot sight, velocity adjustment tool, 12 tubes even the barrel blocker
Ninja grey 50/4500 paintball tank f/s. Hydro good until 2019
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S