View Full Version : 10mm Conversions

September 6, 2005, 07:37 PM
Does anyone know if a 1911A1 in .45 can be converted into a 10mm? A drop in type like the .22.

September 6, 2005, 08:04 PM
Yes but you would need the entire slide assembly and barrel with the proper springs.

September 7, 2005, 07:48 AM
You may as well buy a 10mm 1911.

September 7, 2005, 08:02 AM
This info is probably worthless to the threadstarter, but might be worth something to somebody else reading this thread: Converting a G21 to 10mm involves a simple barrel switch with appropriate recoil spring. Might need to use the new LCI .45ACP extractor.

September 7, 2005, 02:54 PM

Bravo did not ask about a cal swap on a glock. The question was for a 1911. On a 1911 you can not just change the barrel.

September 7, 2005, 03:05 PM
Apparently you didn't read Zekewolfs post SGOTH, he clearly stated that he wasn't addressing the thread starter, but anyone else who happened upon this thread.

September 7, 2005, 04:46 PM
Thank you, Cobray. This is my "Day for Being Kind to my Illiterate Fellow Shooters." :D

September 7, 2005, 05:18 PM
OK my bad. I did miss read the post. Sorry.

September 7, 2005, 07:25 PM
Nope, You can however convert a 1911 in .40S&W to 10MM.
I was going to do this but it was cheaper to buy a Dan Wesson 1911 in 10MM.

Or (GOOD LORD FORGIVE ME FOR SAYING THIS)" Buy a :barf: Glock :barf: .

Thats what I did since the DW is not Calif bribed.. err approved..

September 8, 2005, 04:55 PM
SGHOTH: Please note the " :D " No big deal.

September 8, 2005, 05:01 PM
i have my eyes set on a glock 21 next and will add the 10mm upper for a 13/15 shot combo gun.

September 8, 2005, 08:48 PM
2002gti. You might want to check out the KKM conversion barrel, instead of an entire upper. $165 for the barrel; $15 or so for 15-rd. G20 mags.

September 9, 2005, 02:07 AM
Ramcharger... My brother ran into the same roadblock and he may just take your easy way out. :barf:
Needless to say i'm not of the glock persuasion.

September 10, 2005, 10:13 PM
I was anti Glock for a very long time. Bought my first G21 and never looked back. Handles DoubleTapps with ease and recoil is much better than my Kimber. Runs better too.

Remember that most 1911 makers DO NOT KNOW HOW to make 10mm guns. Colt had the problem and Kimber followed in the same footsteps. Do your research here:


and other google searches will give you even more.

September 13, 2005, 06:09 AM
i looked at kkm's website but didnt see a 10mm conversion barrel for the G21. know where i can find one, is it a new item? ive heard about it before too.

September 13, 2005, 10:14 AM
Go to glocktalk.com, and click on "The 10 Ring" forum. You'll get lots of good information there. Kevin, at KKM, will be happy to answer your questions if you either e-mail or call him. Bar-Sto also makes a 10mm conversion barrel for G21s. Most of the guys on GT who are converting are springing for the longslide. If I were buying a 10mm conversion barrel, I'd consider KKM's threaded, compensated barrel, but the longslide (@ just under $600 just for the slide) wouldn't appeal to me at all.

September 13, 2005, 02:01 PM
There is some argument that a drop-in barrel for a G21 isn't as strong as it should possibly be for hot 10mm. If I were to do this personally I'd hunt a G20 or perhaps a G20 slide. The metal is thicker since they needed to find .025" on either side of the barrel in the G21 models. G20 came first and was the base design.

September 13, 2005, 06:31 PM
There is no sensible argument that a drop-in 10mm conversion barrel won't work and isn't safe in a G21 slide. The slide, OF COURSE does nothing to contain pressure. The only reason the slide of a G20 is heavier than the slide of a G21 is to control the slide speed with the same recoil spring mechanism.

Folks shoot .45 Super and .40 Super through G21's all the time. Both rounds are stouter than 10mm. Just use the right recoil spring and you won't have any problems with a 10mm conversion barrel in a G21 slide. Opinions to the contrary are based on speculation founded in ignorance of simple physics. ;)

September 14, 2005, 08:48 AM
You're right, it does nothing to contain pressure. But it does take the inertial impact at the end of spring travel since the travel limit forces are set onto a point around the guide rod at the front of the slide.

I would simply rather have a heavier slide so as to not *need* a heaver recoil spring.

And sticking a huge font in the middle of a response is rather rude, IMHO. You don't need to shout in here.