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870 mag tube dimensions

Discussion in 'Shotguns' started by o Unforgiven o, Sep 16, 2014.

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  1. o Unforgiven o

    o Unforgiven o Member

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    Can someone with calipers measure the OD & ID of a 12 gauge 870 mag tube? It would be much appreciated.
     
  2. gamestalker

    gamestalker member

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    Will do, just give me till morning.

    Just out of curiosity, what is it you are doing that you need these measurements? Adding a magazine extension possibly?

    GS
     
  3. o Unforgiven o

    o Unforgiven o Member

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  4. Fred Fuller

    Fred Fuller Moderator Emeritus

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    My conclusion several years ago was to not try and remove mag tube dimples on a multi-use 870. It's more trouble than it's worth IMO and it opens the door to a new set of potential botherations, like keeping the mag tube cap on without the factory retention mechanisms (old or new) in place. Yes, there are workarounds to that, if you want to go that route. And 'ironing' out dimples should be done very carefully, lest the threaded end of the mag tube get distorted.

    However, it's your shotgun...
     
  5. gamestalker

    gamestalker member

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    Oops, sorry, I forgot about your thread. I'll take those measurements right now and have them posted in a few minutes.

    GS
     
  6. gamestalker

    gamestalker member

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    Od = .856"
    id = .790"

    gs
     
  7. tiamat

    tiamat Member

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    Those dimensions can't be right. The rim of a 2 3/4" Rio 00 Buck 12 gauge shell alone measures on my calipers out to .878" which makes it wider than the OD of the tube you measured. Sure you're not measuring a 20 gauge or something?

    The OD of the mag tube of my 870 Express Magnum, parkerized, is 1.007" and the OD of the factory mag tube extension is exactly 1.000"
    ID is about .918"
     
    Last edited: Sep 18, 2014
  8. gamestalker

    gamestalker member

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    Sorry about that, I mistakenly measured the .20 ga..

    12 ga.
    OD = 1.00"
    ID = .916"

    GS
     
  9. o Unforgiven o

    o Unforgiven o Member

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    Thanks guys.
     
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