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AR15.COM
3/7/2007 9:06:09 PM EDT
can you also convert these to 10mm as well
3/12/2007 7:09:32 AM EDT
[#1]
Yes, you'll need a 10mm upper, and some modified magazines.

Easiest thing to do is buy both a 21SF, and a 20.
Switch the uppers.
Take the 10mm mags and modify them yourself with an exacto knife.  You whould be good.

Also, I have a Blade-Tech holster designed for a GLOCK 20 with a Streamlight M6 mounted.   The holster will not fit the 21SF with the M6 because the 1913 rails hangs a little lower than the regular GLOCK rail.