And for .22LR builds, if you use the Chiappa .22LR upper. I actually rather think it would be a better deal than even the 15-22.
Just make sure to either A: Shave your polymer hammer width down a bit with a dremel (what I did) or B: Replace the hammer with a Blowback PCF hammer. Some blowback operated uppers may be slightly different proportionally with the carrier which can interfere with the PCF wider polymer hammer.