PJones said:
Also last time I was at the range I saw they had a glock conversion kit that goes from 9mm to .22. I believe it was by lone wolf. I think it was around 300 bucks though.
Midwayusa.com has had a conversion, I think they still do. Just search for it. I believe its for the G22. And yes, it was expensive.
I have one for a 1911 and it's great except it's just for one of my 3. The oldest, made in 1936. Both the conversion and the pistol stays in a safe, not to be used. I thought about tinkering with it to get it to fit but I don't want to ruin it.
The biggest problem with it was the mags are a pain to load and expensive themselves. It's much easier to burn through a 10 rnd .22 mag than a 7-8 rnd .45. I spent most of the time reloading. I have the same issue with my AR .22 conversion. Five seconds of kick a** plinking and 2 minutes of reloading.
The other thing to be mindful of, in my opinion, you practice shooting to gain muscle memory. Both in trigger pull and recovery from the recoil and getting back on target. A .22 will obviously have a different feel. It's just an observation that I believe in and prevented me from buying a conversion.
It's up to you, but I'd rather shoot full size ammo and KNOW I can put down the crack heads or zombies than HOPE I can.