I have a 1st gen Dualshock 4. The rail and analog sticks fit perfectly. I haven't carried any shell casings, so I can't speak to them, but I'm sure they're fine. I really like the feel of these sticks and buttons. It should be possible to enlarge the image I posted and see how the raised lines intersect. I'm sure they don't do anything but it looks cool and feels good on the thumb. sticks. I'm mad at Sony for not selling the DS4 with the option of metal counterparts. The weight feels great and I never have to open my controller to adjust these beauties so can't ask for more. Of course, you'll have to take the controller apart to use it, but you can find plenty of YouTube videos on how to do that. do this. If you can follow the instructions, you can do it.