SOURCE: Bostitch RN46-1 roof nailer won't
check the height of the magazine, but I think that you have a problem with the feed piston or there is a spring on the feed pawl that might be broke. Unload the nails and dry fire the tool with the door open observing the piston movement. It should "SNAP" back and forth if it does unplug the air and check to see if the spring that applies pressure to the pawl is broken or missing. I am going to guess the piston. If this tool has not been serviced in a while the asphalt tends to jam up the mechanisms. Let me know if you need more assistance.
SOURCE: My Bostitch N12 won't advance nails
It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.
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