Lots of places sell them. They're super finicky though and I would just buy a .22 (Browning Buck Mark or Ruger Mark whatever) if that's your thing.
http://www.firearmsoutletcanada.com...n-kit-for-glock-17-22-gen-4.html#.WSzMou2fAe0
I have the AA slide and G22 lower IRG sold for Boxing Day. Got a great deal, and it runs like a top with Remington Golden Bullets and Winchester M22, which is what I had on hand.
Mine says don't use Federal in bold letter but meh I got through about 400 rounds of Federal only 3 to 4 light primer.. no biggie. CCI mini-mag 40gr runs flawless so far.



























