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AR15.COM
11/18/2012 5:45:04 PM EDT
I have a Glock 21SF 45Acp.Will a 10mm barrel fit .
11/18/2012 7:12:13 PM EDT
[#1]
Yes it will.  



A 45 will not fit in a 10mm though.


 
11/18/2012 8:00:47 PM EDT
[#2]
Barrel hood width isn't the same, nor are the extractors the same.  Might try a 10mm conversion barrel.
11/19/2012 2:28:23 AM EDT
[#3]



Quoted:


Barrel hood width isn't the same, nor are the extractors the same.  Might try a 10mm conversion barrel.


Yes, this is true, but I've shot a lot of rounds out of a Gen 3 21 with a factory 20 barrel. No malfunctions YET and no discernible difference in accuracy.   The op wanted to know if it could be done / fit.  It does and many have done it with no problems.