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What Fits What? Can a G21 SF .45ACP be a 10mm also?

#1 User is offline   redmanfixit 

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Posted 13 October 2009 - 06:45 AM

Since my supply of money is finite and my desire for shooting fun is large, I'm always trying to maximize fun vs $$$. I have a G21 SF which I really like and runs well for me. Found a carbine upper in 10mm in a shop the other day (I bet many of you have seen these) made to fit a Glock frame. I am wondering if anyone knows if I can use a .45 ACP G21 SF lower with some combination of mags and DooDads to allow me to run this 10mm upper for carbine side matches at my local club?? Does anyone know??
Thanks in advance for sharing your experiences!
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#2 User is offline   Aircooled6racer 

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Posted 13 October 2009 - 07:29 AM

Hello: If it is a Mech Tech upper and is for a large frame Glock then yes it will work. I am not sure you want to be shooting 10mm since it will cost more than shooting 45 for brass. I have 2 Mech Tech uppers and they work perfectly on a Glock 17,34 and 35. Mine are 9mm though and I use the Glock 33 round mags for carbine matches and some steel matches. The are alot of fun. Thanks, Eric

#3 User is online   Flexmoney 

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Posted 13 October 2009 - 10:26 AM

A G21 slide has different features than a G20 slide. The G21 slide is lighter and also has a wider breech face, I believe. Maybe a different extractor?

The lowers ought to be about the same. Maybe a change of ejectors?

While I am not sure, I would guess that you can likely run the setup you are looking at.
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#4 User is offline   Duane Thomas 

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Posted 13 October 2009 - 10:30 AM

Call the manufacturer of the upper and ask them.
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#5 User is online   bikerburgess 

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Posted 02 November 2009 - 06:41 PM

Mechtek large frame glock uppers can be either 45 or 10mm or 40 on the same frame I would check with them to make sure there are no problems with the short frame guns fitting.
I keep thinking about getting one for my g20. But haven't had the funds yet.

#6 User is offline   redmanfixit 

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Posted 02 November 2009 - 07:00 PM

A couple of my friends have them and use them for side matches. They seem to give pretty good wack. I don't use a carbine that often, but I found a 10mm version and just got to thinkin!! Thanks everyone for the input!
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