Originally Posted by DONSTER 125
the one on the left is the KSC one. i am placing my answer without looking at other peoples posts.
I just checked closely as the pics were loading, saw the base and the takedown pin to take the mag apart, then looked for what others said. If it was a G22 or larger calibre, if it was a Gen 3, it'd likely have dual pins above rear of the trigger instead of one. But Gen 2 and upwards have the grips shaped like that, with finger grooves.