SOLD PENDING FUNDS (as of 7/1 at 1pm) $85 Lone Wolf Distributors 9mm conversion barrel for Glock 22 or Glock 31. Some say all you need is a G17 recoil spring and 9mm mags. For safety, I like to switch out the extractor assembly and trigger housing, too, but your mileage may vary. I've decided to go with a threaded conversion barrel, so this one can go to a new home. I've only shot a few boxes (it shot all ammo flawlessly, BTW, even 115gr) out of this barrel and it is in spectacular condition.