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.
Stock Dm12/13 Bolt wanted. Don't want to spend a fortune on a BW bolt lol. PM me.