[fred cook]

My favorite and most reliable 22 conversion is a Sig unit that goes on top of a Sig P220 frame. The mags are propriatary (?) to the Sig pistol and can be a bit hard to find. Unless something is really dirty, it always works unless the cartridge is bad. I don't know if Sig still makes these conversion units but I recommend trying to find one. Of course then you would have to pick up a Sig P220 (wink, wink) to make it all work.