Mossberg 500 AT pump

Discussion in 'General Hi-Point Discussion' started by Bmason_80, Mar 15, 2016.

  1. Bmason_80

    Bmason_80 Supporting Member

    I got a new/old shotgun today. It was my grandfather's who recently passed. I am wondering if there's a way to find its age based on the serial number? The serial number starts with G56####. I apologize if this thread is in the wrong forum
    Last edited: Mar 15, 2016
  2. Outlaw

    Outlaw Supporting Member

    Call or email Mossy at 800-363-3555 with the Ser # and they will tell you exactly when it was put together. Hope it helps

  3. Bmason_80

    Bmason_80 Supporting Member

    I called Mossberg and customer service told me it predated their records. They give me another # to call ... She said it was a historian .
  4. ajole

    ajole Supporting Member

    NE Utah
  5. Bmason_80

    Bmason_80 Supporting Member

    Thanks for your help. I haven't heard back from the historian that Mossberg referred me too.. I took it apart because it appeard to be dirty.. It had been a long time since it had been disassembled.. Once I had all the internals out I was unable to get the forend off. Gave up on that. This is my first pump and it took awhile to get the bolt and carrier back together.
  6. moona11

    moona11 King of you Monkeys Lifetime Supporter

    Take your time. It will go back together when its ready. Lube the forend over night it should come off.
  7. Bmason_80

    Bmason_80 Supporting Member

    I figured out that it s gotta be just right.. I'm sure it gets easier after a few times. I ll try the forend this weekend but I couldn't see anything holding the guides of the forend in the receiver.. Just the grooves they ride in
    Last edited: Mar 17, 2016
  8. cicpup

    cicpup Resident PITA Supporting Member

    They tend to catch on the notches. Pushing down on them while sliding it out tends to work.
  9. lsi1

    lsi1 Member

    also if you unscrew the magazine tube carefully they come off easier and that lets you clean 40 years of accumulated gunk out of that tube and replace the spring while your in there.

    Of the top of my head I can't remember the date of the switch but the oldest 500s do not handle 3 inch shells if the receiver is stamped 500A then it will handle a 3 inch load.
  10. Bmason_80

    Bmason_80 Supporting Member

    It is stamped on the barrel 3" and 2¾"
  11. Cynical

    Cynical Member

  12. Bmason_80

    Bmason_80 Supporting Member

    That's who Mossberg referred me to. I emailed them and have not gotten a response.
  13. Cynical

    Cynical Member


    Small shop so it might take a few days.