I'm sure this has been posted before, but since there has been some discussion lately on the various generations and comparisons back and forth I thought it might be interesting to toss it in a fresh thread. This isn't meant to be a 'versus' thread, rather just detailing the differences from one gen to the next. The title of the thread states gen 5 & gen 4 but there is discussion on gen 3's as well. Note that the video from Sootch00 is 2 years old. It won't take into account the move away from the half moon cut out on the gen 5's as well as the front serrations. Also note that Glock hadn't yet beveled the frame to match the slide on the gen 5 at the time of this video. They later corrected this so that they matched.