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Mossberg 500 Barrel ?

Discussion in 'Shotguns' started by 461, Mar 1, 2008.

  1. 461

    461 Well-Known Member

    Hi All,
    I bought an 18.5" barrel for my sons 20ga. Mossberg 500 and when I put it on I noticed something. There is a slight gap between the barrel lug as it screws into the mag tube. I thought it looked odd so I put the longer 24" barrel back on it and noticed the same gap. Was the gap always there and I just didn't notice or is something messed up?
  2. Blue .45

    Blue .45 Well-Known Member

    I have a 12ga. 500 and it also has the gap.
  3. mnrivrat

    mnrivrat Well-Known Member

    Gap is normal - the rear of the barrel extension seats into the frame - this is help tight wth the lug screw and a slight gap between the lug and end of the magazine tube is as I said - normal.
  4. Harvster

    Harvster Well-Known Member


    Can I ask where you purchased your barrel? I am looking for a 18.5" for the wife's 20 ga and am having trouble finding one.
  5. 713832281

    713832281 Active Member

    me too, i been looking for a 18.5 inch barrel for my gals 20 gauge also.
  6. 461

    461 Well-Known Member

  7. Harvster

    Harvster Well-Known Member

    Thank you. I've searched off and on for the last year and hadn't found them.
  8. EHCRain10

    EHCRain10 Well-Known Member

    is that a smooth bore or rifled barrel?
  9. foghornl

    foghornl Well-Known Member

    Mossberg states in the manual that a small gap between the barrel lug and takedown screw is normal.

    Ahh here it is...from page 6:

    500®, 505™ and 535™ Models: Slide the barrel into the receiver and tighten the takedown screw, finger tight only. DO NOT use pliers or a wrench to tighten the takedown screw.
    A little space between the magazine tube and the takedown mount is normal.

    Both my 1990 vintage Maverick 88 and 1960's Mossy 500 have a smalll gap, less than 1/8", but it is there.

    Hmmm Mossberg only seems to offer a 24" or 26" barrel in 20Ga.
  10. 461

    461 Well-Known Member

    The two 18.5" ones I've got are both smooth bore and both made by Mossberg.

    They are out there and make a really nice little gun when mated with the youth stock. I think I shoot it more than the kids do. :D
  11. blindeye_03

    blindeye_03 New Member

    Sorry for bumping an old thread, but I just got a 500a used yesterday and noticed I have this gap also on mine. Ive been told by a few people that its excessive. What do you think?

  12. RetiredLawman

    RetiredLawman Well-Known Member

    Mine has as much or more gap. I'd say yours is perfectly normal. Better than most I've seen. The gap is a non-factor. Headspacing is. That gap has nothing to do with headspacing. If it shoots, not to worry.
  13. steveracer

    steveracer Well-Known Member

    I added a washer to mine. Easy fix.
  14. Good find!

    The moss has that gap in the front of the tube, no worries.

    NOW... what is really important is that the back of the barrel fits perfect into the reciever.
  15. maxxwilde

    maxxwilde Well-Known Member

    I'm not a gunsmith, so take this for what it's worth...
    From what I've read and heard that gap isn't just normal, but also neccessary. Without the gap there the barrel lug when fired will beat on the top of the mag tube too much and eventually crack. I'm not really clear on how this could happen since the barrel fits tight into the receiver. But, I've always left the gap there and never had a problem...

  16. blindeye_03

    blindeye_03 New Member

    Good to know, mainly because I havent shot it yet. I measured the gap between the lug and the mag tube to be 1/32" and the gap between the vent rib and the receiver is 1/64".
  17. peck1234

    peck1234 Well-Known Member

    I just recently checked my 500 and there is no gap, it fits perfectly...

    An easy fix as stated above would be a washer, or if you really want you could (very carefully) hack a few threads off...
  18. wrc376

    wrc376 member

    sometimes they dont quite seat right- might try loosening and repositioning
  19. Old Guard Dog

    Old Guard Dog Well-Known Member

    Out of 5 500's I just checked, 4 have a gap and one doesn't. All shoot good.
  20. Buster95

    Buster95 Member

    Is it normal to have a slight play with the barrel of a brand new unfired 590a1? I mean very very little movement less than 1/64".

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