Mossberg 590A1 trigger problem

Discussion in 'Tactical Shotguns' started by Minnow, Oct 26, 2010.

  1. I noticed that the trigger pull on My 590A1 is heavy, so I put it on my digital trigger pull gauge and it averaged around 8 3/4lb's. I decided to remove the trigger group from the gun and lube it up. I sprayed it down good with gun scrubber and then lubed with rem oil. While I was doing this I lowered the hammer down slowly on my thumb. When I went to recock it, it took a few attempts but eventually the hammer cocked. Now the hammer will not drop at all even after I install it. I don't believe any springs or such fell out while I was spraying it down.
    What gives?

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  2. I have to ask the obvious. Safety Off?

    Did you only take the trigger group out or did you field strip the entire shotgun. Did you remove the cartridge stop or cartridge interupt pieces? The long skinny black parts.

  3. Ya, the safety is off.

    I only took out the trigger group.

    I'm familiar with shotguns and have disassembled Mossberg, Remington, Benelli, and a SX3, including detail strips for all and have never had this particular problem.
  4. The hammer is cocked, but their is little resistance when I pull the trigger even with the safety on. The hammer doesn't drop when you pull the trigger.
    #4 Minnow, Oct 26, 2010
    Last edited: Oct 26, 2010
  5. I took the trigger assembly out of my 590 which should be the same other then metal vs. plastic. The only way I can get it so the hammer won't fall is if the slide release lever is pushed all the way in. Does your move freely? I wonder if it got bound up somehow.
  6. The slide release lever is working properly. It is under tension to push it up and it rebounds downward properly.
  7. Just found the problem, Jon. The trigger pin fell out. the one just above the trigger as you look at the housing from the side. now I have to go hunt for it. Thanks for the help!
    #7 Minnow, Oct 26, 2010
    Last edited: Oct 26, 2010
  8. Not sure how much I helped but glad you figured it out. My pin there is in there pretty good. If you need to order it Brownells has been the best sight for me on pieces and parts.
  9. Managed to find the pin out in the grass with my Surefire. Lucky me. Got it all put back together and it works.
    What happened was when I let the hammer down, it took the tension off the trigger pin and allowed it to fall out. I'll be aware of this in the future.
    The oil did not help with the trigger pull though. Still heavy.
  10. I don't have a scale but have always liked the way my shotguns have shot on the range. I have a 500, 590, and a 590A1 not sure what the weight is but they break clean. I hope you can get it where you want it.
  11. It's not a show stopper. About half the current weight of pull would be nice when shooting slugs for accuracy. This gun has GhostRing sights.
    #11 Minnow, Oct 26, 2010
    Last edited: Oct 26, 2010

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