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G21 .45acp - 9mm?

Discussion in 'General Glocking' started by Nooncope, Mar 15, 2012.

  1. Nooncope

    Nooncope

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    Is there a conversion barrel that converts a Glock 21 to spit out 9mm?
     
  2. stolenphot0

    stolenphot0 RTF2 Addict

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    no, but if you make one, I bet it would be a game changer.
     

  3. Nooncope

    Nooncope

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    I read here somewhere that the Glock 20 can shoot:

    9mm
    9x25 Dillon
    10mm (of course)
    .357 Sig
    .40 S&W

    all with a swap of a barrel.

    Then I saw here that the stock 10mm barrel can be used in a Glock 21 but the stock .45acp barrel cannot be used in a Glock 20.

    Any of this true?
     
  4. stolenphot0

    stolenphot0 RTF2 Addict

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    http://www.lonewolfdist.com/Products.aspx?CAT=241

    yes on 40, 357 sig, 9x25 Dillon. Looks like no on 9x19.

    I don't know about the .45 conversion.
     
    Last edited: Mar 15, 2012
  5. nastytrigger

    nastytrigger Mediocre Member

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    There would have to be a proprietary magazine for a G21 9mm conversion even if a barrel existed.
     
  6. GRT45

    GRT45 Transform & Win

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    The above is true.

    While it's true that a stock G20 10mm barrel will function in the G21 slide (or G29 barrel in G30 slide), it is not the best option. The fit in most dimensions is good, except the stock 10mm barrel chamber hood is narrower than the 45ACP by slightly over .050" and the chamber to breechface interface is undersized. An aftermarket 45-10mm conversion barrel makes the adjustment, plus it has better chamber support and is suitable for shooting non-jacketed, hard cast lead bullets.

    The caliber/ammo conversions commonly available for the Glock 21 and 30 45ACP pistols include:

    10mm
    .45 Super
    .400 CorBon
    .40 Super

    A more complicated (and expensive) conversion of the G21 to .50 GI is possible with a full upper and mag swap.
     
    Last edited: Mar 15, 2012
  7. Nooncope

    Nooncope

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    Thank you everyone for your responces.
     
  8. vafish

    vafish

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    No,

    The case head of the .45 ACP is just too large compared to the 9MM.

    The reason the 40-9 conversion barrels work is because the difference between them is small enough the .40 extractor can still effectively reach the 9MM rim. The .45 extractor just doesn't have enough reach to get to the 9MM.