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Reverse order of how you took it apart lol...I'm guessing it's a Mossberg 500? Check their website for an owners manual...it will explain how to reassemble.
The firing pin has to drop before it will pump. The button underneath is to safely unload it. If you have it unloaded or use whats called snap caps you pull the trigger and then the action will unlock. Here is a manual and that is covered on page 2. Mossberg 500 pump manual.Hope this helps FixYa up.
This may be a bit tricky. If you have pulled the trigger as you re-insert the bolt and that has not worked. You may have to arm the bolt, try with safe off and pull the trigger as you reinsert the bolt. You may have to pre rotate the Coc piece into the slot in the receiver.
I would try oiling the mechanism first, and it may have a trigger adjustment that may be modified for the trigger pull. Odds are it may have some friction on the trigger mechanism at first and may just need some lube. Try this and if all else fails, take it to the dealer that you purchased it from and have them evaluate it.
Hope this helps
take the back cap off of the nailer. There is another loose cap in that head, most times that gets stuck. Believe me, I was raised by a carpenter that had nail guns before anybody else did. Also, sometimes that plunger gets bent, just straighten it out. Check for blown o rings. If it is old, take the trigger assembly out and clean it out. Be sure to oil everything well before you put together. We use marvel mystery oil, or nail gun oil.
if you took the trigger apart the part that you unscrew has a nylon ball and a black rubber ring you should check them and make sure that you didn't loose them when you took it apart,if they are there, then you need to service the gun, and after you clean all the moving part and you put it back together, it may still leak from the top,Take a rubber hammer and give it a good hit,now not to hard, and it should seal
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