.......You really should of just got a g-20 IMHO there are some issues with converting the 21. Yeah it works but you should do a search on here and read about it but hey, welcome to the 10mm club! after you shoot some hot loads you'll probably want that g-20[/QUOTE]
I have done this "conversion" as well with just a standard G-20 lonewolf barrel and a mag change and have had nothing but good luck with it. I didn't even swap out the extractor. If you have any links about the "problems" please post them so I can read up on it. Thanks.
Oh and by the way, to the OP, ditto on the Double Tap, or start rolling your own.