Glock 21 to 10mm conversion
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  1. #1
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    Glock 21 to 10mm conversion

    Im interested in converting my Glock 21 to shoot 10mm rounds. i believe i would need a conversion barrel, a 10mm magazine, and ive also read that i would need to upgrade the spring.

    is there anything else I'm missing?

    any suggestions for a conversion barrel and spring would be appreciated

    thanx
    Last edited by LOADEDx; 02-02-2013 at 07:52 PM.
    -Beretta Px4 9mm
    -Glock 21
    -Glock 30
    -Sig P226

  2. #2
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    You will need a full top end (slide, barrel etc.) plus mags to do that.

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    Quote Originally Posted by LOADEDx View Post
    Im interested in converting my Glock 21 to shoot 10mm rounds. i believe i would need a conversion barrel, a 10mm magazine, and ive also read that i would need to upgrade the spring.

    is there anything else I'm missing?
    According to the The Complete Glock Reference Guide (Third Edition), G20 barrels will not fit in the G21 slide (page 144). This is pretty old information (circa 2006), so it does not cover the Gen4 models, but I have no other updated information on barrel fitting. So you would need the slide, as Vindic8 noted.

    A complete upper assembly for a G21 will cost about $360 plus shipping (http://www.glockmeister.com/GLOCK-20...info/G20UPPER/). The slide alone will cost about $210 plus shipping (http://www.lonewolfdist.com/Detail.a...D=1178&CAT=247), and I can recommend Lone Wolf for slides and barrels.

    If you plan to go that far, reply to this post and I'll provide the complete list of parts needed. It's more than the top end and the magazine.

    Chris
    Last edited by cohland; 04-04-2013 at 02:23 PM.
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  5. #4
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    Loaded,

    I highly recommend going the route Chris described above. It makes for a very versatile platform. I went the other direction starting with a Gen3 G20SF and picking up the G21 Top end. I also have a Lone Wolf 10-40 Conversion barrel so the one rig will shoot 10mm, 40SW and 45 ACP.


    Last edited by Vindic8; 05-25-2013 at 09:10 PM.

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    I have a G21 Gen 4 and I'd also be interested in what a conversion to 10mm would entail.

    I really have no pressing desire, however I do tend to hunt some very thick mountainous terrain at times, and I've often thought how nice it would be to carry a pistol instead of a rifle when I'm doing pushes.

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    Quote Originally Posted by NYY23 View Post
    I have a G21 Gen 4 and I'd also be interested in what a conversion to 10mm would entail...
    OK, after a search of the parts list, I found that there is ONE part that is needed, not including the magazine, slide and barrel already mentioned: it is the Extractor (LCI), Part Number SP 01909. This was a surprise to me, I expected that a bunch of parts would need to be changed.

    Everything else is the same part for both guns (unless my eyesight has failed me), which sort of stands to reason since they're both pretty stout.

    So, since you need a different slide anyway, you can just get the whole slide built up with the right extractor, and you're ready to go.

    Chris
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    Just an FYI. This is actually the guy I bought my G21 upper from.

    Glock 20 10mm complete slide barrel upper kit : Pistol Slides at GunBroker.com

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    I have a G20 and a G21 and was interested in converting the G21 to a G20 so that I could have one gun that could be changed to either caliber. In most of the other caliber conversions, the difference between a regular barrel and a conversion barrel is that the conversion barrel has thicker walls on the barrel so that it still has the same outer diameter as the other caliber and will have the same clearance going through the barrel hole in the slide. That is why it is possible to convert a .40 Glock to a 9mm, but not the other way around. I was expecting the same thing with converting the .45 G21 to a 10mm G20, so I field stripped both of them and examined them. Unfortunately, I did not have a micrometer handy to get absolute measurements, but as far as I can tell, the outer diameter of the .45 is the same as the outer diameter of the 10mm. The 10mm barrel wall is noticeably thicker than the .45 barrel wall. Putting the 10mm barrel in the .45 slide seemed to fit with just as much clearance as the original .45 barrel. I loaded a 10mm mag in the G21 that now had the 10mm barrel and cycled a mag full of 10mm rounds without a problem in loading or ejecting. I put some 10mm rounds in the .45 mags and they even loaded and ejected, but it was pretty obvious that they were riding a bit higher in the mag than they were in the 10mm mags. Putting .45 rounds in a 10mm mag though did not work as well. One of the rounds that I used was the classic 230 gr FMJ round nose (Winchester white box) and it was extremely difficult for me to even unload the round from the magazine with my fingers. It was in there rather low and tight. I nearly had to disassemble the magazine to get it out.

  10. #9
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    Quote Originally Posted by JakeBlanton View Post
    I have a G20 and a G21 and was interested in converting the G21 to a G20 so that I could have one gun that could be changed to either caliber. In most of the other caliber conversions, the difference between a regular barrel and a conversion barrel is that the conversion barrel has thicker walls on the barrel so that it still has the same outer diameter as the other caliber and will have the same clearance going through the barrel hole in the slide. That is why it is possible to convert a .40 Glock to a 9mm, but not the other way around. I was expecting the same thing with converting the .45 G21 to a 10mm G20, so I field stripped both of them and examined them. Unfortunately, I did not have a micrometer handy to get absolute measurements, but as far as I can tell, the outer diameter of the .45 is the same as the outer diameter of the 10mm. The 10mm barrel wall is noticeably thicker than the .45 barrel wall. Putting the 10mm barrel in the .45 slide seemed to fit with just as much clearance as the original .45 barrel. I loaded a 10mm mag in the G21 that now had the 10mm barrel and cycled a mag full of 10mm rounds without a problem in loading or ejecting. I put some 10mm rounds in the .45 mags and they even loaded and ejected, but it was pretty obvious that they were riding a bit higher in the mag than they were in the 10mm mags. Putting .45 rounds in a 10mm mag though did not work as well. One of the rounds that I used was the classic 230 gr FMJ round nose (Winchester white box) and it was extremely difficult for me to even unload the round from the magazine with my fingers. It was in there rather low and tight. I nearly had to disassemble the magazine to get it out.
    Two elements are different between the two. The extractor and the ejector. Both are vital to reliable cycling. You may get it to function most of the time with some ammo but there is no way I would trust my life to such configuration.

  11. #10
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    I tried another experimentation tonight. I took the G21 slide and installed it on the G29 frame. This seems to have turned out to have been a really BAD idea. I can't seem to remove it now and it won't slide all the way to the point where I can pull the trigger to get to that part in the field stripping procedure.

    Ooops... Anyone have any ideas? The G29 has the double spring mechanism and the G21 has a single spring.
    Home is where the RV is...

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