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Glock magazine capacity

Discussion in 'Handguns: Autoloaders' started by timd, Jan 10, 2013.

  1. timd

    timd Member

    What is the internal difference between a 10 round magazine and a standard capacity magazine. Is capacity limited by the follower, or some insert like a plug in a shotgun? Or is it limited by some permanent difference in the mag body?
  2. mgmorden

    mgmorden Well-Known Member

    The mag body is molded with ribs it in that force the mag to essentially single-stack the cartridges (at least that's the case for the 9mm 10-rnd). Works fine for feeding 10-rnds, but from my understanding its not reversible.

    Other companies (I know S&W and Ruger) have a basically compact-sized mag body that only holds 10-rnds and then attach a plastic base that extends the rest of the way down the mag-well. Not much you could do there as its literally only half a mag body.
  3. ku4hx

    ku4hx Well-Known Member

    Ruger does it like this. Both are 10 round, both will work in the SR9c, only the longer of the two works in the SR9 and both plastic bases are removable.

    But the metal bodies are exactly the same.
    Last edited: Apr 20, 2015
  4. rcmodel

    rcmodel Member in memoriam

    10-round Glock mags are reduced by a shallow V-fold in the steel liner, which is molded inside the plastic mag body.
    It prevents the rounds from nesting in a normal double-stack configuration.

    There is no getting around it!


  5. hentown

    hentown Well-Known Member

    The ONLY use I can think of for neutered Glock mags is that I found that I could never get .400 Cor-Bon or .40 Super to feed from standard-cap, double-stack Glock mags. Both feed o.k. from the Klintonista mags.
  6. jmr40

    jmr40 Well-Known Member

    Actually there is one way around it. If you own a G-17, buy 10 round G-22 mags. They hold 15-16 rounds of 9mm IIRC. They fit and function just fine in 9mm guns. Same with 10 round .40 mags working in 9mm Sigs and Beretta. Would also work in the old P series Rugers. Not sure about the SR series of Rugers.
  7. WinThePennant

    WinThePennant Well-Known Member

    I'm going to tuck this little tidbit away .... Just in case.
  8. hentown

    hentown Well-Known Member

    If you conform those .40 feed lips to 9mm feed lip specs, they'll work even better. ;)
  9. Dan-O

    Dan-O Well-Known Member

    ^ Or even better why not put a 9mm follower in the 10 round G22 mag body?
  10. hentown

    hentown Well-Known Member

    Yeah, I'd use a 9mm follower, but that's irrelevant to my recommendation; you'd still need to conform the feed lip separation to 9mm specs.
  11. Dan-O

    Dan-O Well-Known Member

    I'm assuming the feed lip would need to be altered or the rounds won't stay in the mag?
  12. Jimfern

    Jimfern Well-Known Member

    I'm going to see if I can scrounge up a G22 10 rounder to try it out. Thanks for the tip.
  13. danez71

    danez71 Well-Known Member

    The SW M&P9c compact use a shorter mag body and taller mag base for the 10 vs the 12 round mag.

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