I had the opportunity to shoot a Gen 5 G17. The trigger is much better than previous versions. The flared mag well was okay. I got caught up on the grip plug area. You will have to do all the things to Gen 5 that you did to Gen 3 and 4. Scrap the sights, undercut the trigger guard, front slide serrations, polish the internals, plus with Gen 5 file off the sharp edges of the flared mag well and get a grip plug. The front frame doesn't match the new slide taper. The new magazines were orange. I didn't ask if they were back ward compatible. As this Generation floods the market at least the Gen 3 prices will go down.