Update… found a NOS g20 slide and barrel for a reasonable price felt lucky to get it for about $50 more than all the new parts of a conversion. Including barrel g20 extractor and new recoil spring on glockstore

Original Post:
I Picked up a used gen3 g21 SF a while back at a local auction for a cheap price thinking I’d grab a g20 slide and make myself a 10mm. Already have a G21 SF… Well the OEM g21 uppers are nearly the price of a new gun and aftermarket needs all the guts and sights. Well glockstore sells a 10mm barrel thay is externally same size as 45 barrel and is a direct install for a g21 slide. Maybe need to also install a 10mm extractor. Lenny McGill has a cool vid and seems to be an easy swap just grab some 10mm mags and you’re golden.

Has anybody here gone this route ? Any issues ?
Thanks in advance

This message has been edited. Last edited by: ElToro,

I have talked to two guys who had each used the KKM brand conversion barrel to turn their model 21 into a 10 mm. They were happy with the results. It was a simple drop in/no fitting process.

As long as what you're buying is listed as a "Conversion Barrel," then the barrel, magazines, and ammo are all you need. I bought a stippled G22 several years ago and popped in a 9mm conversion barrel and everything ran 100%. I almost got a .357 SIG barrel for it, but decided to sell it before hand.

I have owned a couple of the Glockstore diamond conversion barrels and have never had an issue. They seem well made and needed no coercing or fit adjustment. KKM is another quality barrel maker for a drop in.