Looking at an older Gen2 gun yesterday and comparing to a gen 4, other than some grip texturing I can see no major differences in the guns, they sure do not seem to have made any mechanism changes.
Grip is different. Mag release is different. Recoil spring system is different. I wish they had never added the finger groves. Completely unneeded. Anyone who wanted finger grooves could have purchased them from Hogue.
