the MCK roni is a nice carbine kit.
It IS on the fragile side--i wouldn't be banging it around.
it will work(the 1 in the pic) with a g17,22,23,19.
the cocking serrations have to be the standard type--no fish scale type.
you convert between full size(17,22) and and compact(19,23) by taking out 2 hex screws and moving the barrel shroud(you know,that shoulder thing that goes up

)
forward (for 17,22--the shroud shows "17") and collapse it for the 19 and 23.then reinstall the screws.
also,being in Canada you can choose between pistol brace and SBR stock.