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Glock 33 .357 SIG conversion?

Discussion in 'General Glocking' started by M2 Carbine, Jun 19, 2012.

  1. M2 Carbine

    M2 Carbine

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    As my friend said, "For someone that doesn't like Glocks you are getting a lot of Glocks".
    G26, G19 and now a G33.

    I got the G33 last week and I have a few questions.

    Magazines?
    Can a 40 S&W mag be used in place of the .357 SIG mag or the .357 mag used in 40 S&W?

    Conversions for cheaper shooting?
    Anyone done this?
    I understand the G33 can be converted to 9mm or 40 S&W with just a barrel swap but how about the extractor, ejector for 9mm?

    I've seen ads for aftermarket replacement barrels for about $110. Why can't a Glock 9mm or 40 S&W barrel be used?

    I don't plan on doing it but would my G26 barrel be a drop in conversion for the G33?
     
  2. pizza_pablo

    pizza_pablo USN Retired

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    Some believe the set up I describe is good enough for carry. Some believe changing extractors / ejectors are neccessary for carry, while others believe in "nothing but bone stock" for carry.
    YMMV.
     
    Last edited: Jun 19, 2012

  3. Chowser

    Chowser

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    We have done the opposite, when we switched to .357, guys with their 23 and 27 just bought .357 barrels. So you can just use a stock Glock barrel from a 27 (or a 23) in your 33 (but not the 22 barrel).

    Magazines we didn't bother changing the follower in the .40 mags unless we had issues, which for the most part, we did not. some guys are still carrying their Glock 27s with 33 barrels and .40 marked mags.

    The 9mm barrel will not fill the hole in the slide, it is a little smaller in diameter.

    I've run a conversion barrel for 9mm in my 23 and 32 with no issues, but ended up selling it. i didn't have any issues without replacing the ejector,etc. i sold the barrel because i already had a Glock 19. duh, wasting money. i originally bought a threaded conversion barrel but decided to get a suppressor for my rifle instead of the pistol.

    you already have a 26/19 so keep the 33 as a .357. If you really want, you can get a Glock 27 barrel to shoot .40 out of it. I know I had a bunch of old barrels from the 27 sitting around when we switched. I'll see if the guys still have them in their locker and are willing to sell. doubtful since most probably lost theirs.
     
    Last edited: Jun 19, 2012
  4. barth

    barth six barrels

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    Magazines?
    Can a 40 S&W mag be used in place of the .357 SIG mag or the .357 mag used in 40 S&W?

    The followers are different.
    For the range it doesn't matter.
    For carry I'd use the right followers.

    Conversions for cheaper shooting?
    Anyone done this?
    I understand the G33 can be converted to 9mm or 40 S&W with just a barrel swap but how about the extractor, ejector for 9mm?

    Gen 3 G27/G33 guns are basically identical except for the barrels and mags.
    The RSA is the same in G26/G27/G33 guns.
    The the OEM G27 40 barrel and mags will drop in the G33.
    9mm requires a third party 40-9mm barrel and G26 mags.
    G27 or G33 40-9mm or 357-9mm conversion barrels are identical and
    both will work in the G27.
    The longer G23/G32 barrel, and conversion barrels, will both fit too.
    You can use G23 40-9mm barrel in both G27 and G23 guns.

    You can change the ejector and extractor to 9mm.
    But will lose the ability to swap barrels and mags to go back to 40/357.
    I have 1000+ rounds of HP 9mm through a G27 conversion barrel,
    using the 40 ejector and extractor, with 100% reliability.
    I recommend you do not change the extractor/ejector.

    I've seen ads for aftermarket replacement barrels for about $110. Why can't a Glock 9mm or 40 S&W barrel be used?
    The OEM 9mm barrel will not fit or work.
    The OEM 40 cal barrel will fit and work fine.

    [​IMG]
     
    Last edited: Jun 19, 2012
  5. txgunguy

    txgunguy

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    Yes the 40 mags can be used. I always used a 33 mag when I carried mine.

    I did notice that 40s in a 357 magazine seemed a little tighter due to the different followers.

    As for 9mm, the inside slide diameter is different so a conversion barrel is needed. I had no issues while using just the barrel and 9mm magazine. I wouldn't carry it without changing the ejector and extractor though.
     
  6. M2 Carbine

    M2 Carbine

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    I do have a bunch of 9mm and 40 S&W pistols, so a conversion of the G33 to 40 or 9mm isn't a must do thing. More of a I want to do it just because I can.

    So I understand to change to 40 (my choice) it's just a matter of the correct aftermarket or Glock 27 barrel and may be change the extractor and ejector if need be.

    Thanks for the info.:)
     
  7. Chowser

    Chowser

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    You will only need the Glock 27 barrel to make the change to .40. The extractor/ejector is the same. You probably won't even have to change mags. If it works, then you're good, if not, you'll need some .40 followers or just pick up .40 mags.
     
  8. barth

    barth six barrels

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    +1
    The 40 and 357 extractor and ejector are identical.
    357 is a necked down 40 and the rear case is identical.