First thing I noticed from the outside is the texture on the grip. Its similar to the spiky RTF grip but its not spiky. Small flat squares all around and it provided a good grip. The magazine ejection button is bigger as well. Next thing was that it had interchangeable backstraps. Guy said it came with three sizes. He only had one there so I couldnt compare the others but it felt slimmer than my duty 22 so he must have had the small one on. The big difference though was the inside. The new recoil spring is a multi spring unit like the 27 uses. But this one has three springs supposedly. It had the big spring with a smaller one sticking out of it similar to the 27 but they said there is a third spring inside the big spring. I didnt get to shoot it as he was on the way out but the guys that did said the recoil reduction was quite noticeable. The guy did say though that the new frames and slides wont work with the older ones. Sorry no pictures.