close

Privacy guaranteed - Your email is not shared with anyone.

Do I want a 20 or a 21?

Discussion in 'The SHOT ShowCase' started by DrtyHarry, Feb 9, 2010.


  1. JWP

    JWP
    Expand Collapse

    Joined:
    Apr 4, 2001
    1,089
    0
    got g21 and 2 g20s, reload both 10 and 45 and host of others, got the 6" 10mm to fit the g21 slide and it shoots well w/o changing the extractor

    ultimate goal is longslide for the 6" barrel and use it on the g 21 frame
     

    Wanna kill these ads? We can help!
  2. Girevik61

    Girevik61
    Expand Collapse

    Joined:
    Feb 2, 2010
    308
    0
    Location:
    Kansas
    I'm thinking about a 20SF myself, awesome power.
     

  3. Line Rider

    Line Rider
    Expand Collapse

    Joined:
    Jan 23, 2003
    1,889
    3
    Location:
    Greenbow, Alabama
    If you don't reload buy a GL 21 or GL 21 SF.
     
  4. Brian Lee

    Brian Lee
    Expand Collapse
    Drop those nuts

    Joined:
    Jul 28, 2008
    9,540
    427
    Location:
    Up a tree.
    Yes, yes, and yes.

    DT is one of 5 different brands I've shot and checked, and I've used the same chrono to check other calibers too - it seems to be working fine. And DT clearly states velocities from a G20, with no mention of barrel length, so I assume it's the stock barrel. My results have shown that you have to use the 6" (Glock brand) hunting barrel just to get DT ammo to go 100 to 200 FPS slower than they advertise. With the stock barrel, the velocities are even worse than that, so I don't think I'm tainting the results with improper barrel length.
     
  5. Brian Lee

    Brian Lee
    Expand Collapse
    Drop those nuts

    Joined:
    Jul 28, 2008
    9,540
    427
    Location:
    Up a tree.
    You seem to have it backwards. The G21 & G30 can be converted to 10MM, but the 10MM guns cannot be converted to .45 caliber because the breech face of the 10MM is too narrow to hold the wider .45 caliber shell.

    10MM G21 conversion barrels are available at:

    http://www.efkfiredragon.com/products.php?cat=43&pg=2
    and
    http://www.kkmprecision.com/custom_pistol_barrels/home.php?cat=17
    and
    http://www.stormlakebarrel.com/barrels

    KKM and Storm Lake have them in both standard and 6" lengths, plus KKM has them for the G30, but only in the short length. Apparently Lone Wolf and Bar-Sto do not offer 10MM barrels for the G21 & 30.

    It's well known that people have done this conversion, but since the G21 & 30 breech face & extractor are really not quite right for the smaller diameter 10MM cases, the only issue is whether the reliability is as good as a stock G21 shooting .45 ammo. It's certainly been shown to work, but I was hoping somebody who has done the conversion would jump in here to let us know exactly how well it works.

    It's the exact same issue with converting .40 caliber guns to 9MM because you're changing the diameter of the ammo cases to a smaller size.

    The G20 is the king of conversion versatility because 10MM, .40 caliber, .357 Sig, and 9x25MM Dillon all have the exact same outer dimensions at the rear end of the cases, so the breech, extractor and mags are all perfect for all four calibers.
     
  6. MistoGators

    MistoGators
    Expand Collapse
    0331 - Guns Up

    Joined:
    Jan 29, 2010
    117
    0
    10mm ammo is pretty hard to find and is expensive (even here in GA). Get the slim frame Glock 21.
     
  7. biggin215

    biggin215
    Expand Collapse

    Joined:
    Jan 21, 2010
    184
    0
    OOOO.... GOOD!!! That means all i need to do is drop a few bucks on a 10mm barrel and some mags and I have a 10mm???

    Another question.... Could I put a full size barrel in my G30? Like a 5inch 10mm barrel in my G30 and just have it stick out a little?
     
  8. Cineski

    Cineski
    Expand Collapse

    Joined:
    Jun 18, 2009
    422
    0
    Location:
    SoCal
    Keep in mind, the G21's breech face is bigger than the G20, so you run a risk of failure if using a G21 converted to 10mm in a defensive situation. Plus, the G20 slide is heavier than the G21, and thus it controls 10mm recoil better.
     
  9. AJE

    AJE
    Expand Collapse
    *goes to 11*

    Joined:
    Apr 5, 2004
    1,041
    11
    Location:
    SW Ohio
    I have a G21SF with a 6" Lone Wolf slide and a 10mm conversion barrel.

    I would not recommend this setup (yet) for a defensive gun, as it has not run 100% like my stock Glocks have. I have only put a couple of hundred rounds of 10mm through it at this point, and I'm working on developing some of my reloads with it. The chamber on the KKM is much tighter than a stock barrel which leads to possible misfeeds, especially when it's not cleaned.

    I have also read trouble people have had with the conversion barrels failing to extract. I have rarely had problems with extraction, mine has only been the rounds hanging up while feeding into the chamber. Even then, it might only be once or twice in 100 rounds, but that's still too much for a Glock!

    [​IMG]

    That said, the 10mm is absolutely a kickass cartridge!
     
  10. G33

    G33
    Expand Collapse
    Frisky!
    Millennium Member CLM

    Joined:
    May 29, 1999
    27,930
    1,890
    Location:
    With G29
    Get 21.
    Get 20 conversion barrel.
    Get a 20 mag.
    Enjoy.
    :supergrin:
     
  11. Bello

    Bello
    Expand Collapse
    America/Italia

    Joined:
    Sep 24, 2008
    2,346
    45
    Location:
    East Coast
    do what i do.. get both.. i never use conversion barrels i just buy the gun.
     
  12. DrtyHarry

    DrtyHarry
    Expand Collapse

    Joined:
    Sep 26, 2007
    1,151
    1
    Location:
    NJ/VT

    That is a beautiful looking pistol you have there, I was planning on getting a 6" barrel for it, and now I'm going to have a look at the LWD slides.

    For the reasons you mentioned above, I'm most certainly taking the G20 path. Like I said earlier, if I want to shoot .45, I'll grab one of my many 1911s. Thanks for posting that pic and thanks to all those who contributed here. You guys rock! Oh, and if someone can tell me when a G20sf RTF2 is due out, I'd really appreciate it. THANKS!!

    DH
     
  13. ChuteTheMall

    ChuteTheMall
    Expand Collapse
    HildabeastHater

    Joined:
    Aug 20, 2000
    51,416
    50,160
    Location:
    Anti-Obamaville

    Preferably in olive drab for me.
    :banana:
     
  14. Iceman cHucK

    Iceman cHucK
    Expand Collapse

    Joined:
    Jun 23, 2008
    466
    0
    Location:
    WA state
    I have done the exact same testing of DT 10mm and 45 ammo and experienced the same results as Brian Lee. With a 6" barrel I do not get the claimed velocities of the 4.6" barrel. I like the DT ammo BUT all of mine is at least 100fps under advertised velocities. I have brought this to their attention and have gotten no reply! The Reed ammo tested seems to be right on.
     
  15. kcolg5150

    kcolg5150
    Expand Collapse

    Joined:
    Oct 8, 2009
    18
    0
    Good question,I bought a 21sf and then wanted more bang for the buck,bought the 20 and was very impressed and it's just so different than a 45acp round. The 10mm is to much fun(more expensive) but worth it. If i had to keep one it would be the 10mm....nasty! Love it! So much I bought a 29......even more fun in a smaller package.....it's a disease.......good luck.
     
  16. Max1775

    Max1775
    Expand Collapse
    Marine Infidel

    Joined:
    Oct 1, 2009
    636
    0
    Location:
    Helotes, Texas
    The G21 and G21SF are the same caliber. .45ACP. Do you mean you bought a G20?
     
  17. Gokyo

    Gokyo
    Expand Collapse

    Joined:
    Apr 24, 2005
    1,613
    169
    Location:
    Washington
    I own a g20

    I can I ahve barrels that allow me to shoot.
    10mm
    40SW
    357 sig
    9mm

    Seems like a pretty cool platform.

    All I do is swap barrels, it uses the same extractor and magazines for all ammo.
     
  18. Bigmike75

    Bigmike75
    Expand Collapse

    Joined:
    Jul 29, 2009
    68
    0
    I believe the frames are the same 20 vs 21. Why not buy a second slide and barrel for the other caliber?
     
  19. kcolg5150

    kcolg5150
    Expand Collapse

    Joined:
    Oct 8, 2009
    18
    0
    Yes your correct,I meant 20. Just fixed.Thanks.
     
  20. RonaldG29

    RonaldG29
    Expand Collapse
    Noah's Hero

    Joined:
    Jan 5, 2010
    101
    0
    Location:
    Miami, FL
    G20! all the way.