I have a GEN 4 G21, and I like it even more than my G20LS. There are no words to describe how amazing this thing really is. If you guys get a chance to shoot one, you'll see what I mean. There's absolutely no doubt in my mind that I'm going to buy a GEN 4 G20 the day it drops...
GEN 3 20LS/20SF/21SF/30SF/23/34/26
GEN 4 17/19/21/34/35