Actually, the registration did go away because now you don’t have to do a Form 1 or Form 4, which was always the hold up in this process. Sure you still have to do a 4473, but that was never really the issue in this circumstance.
The old one had a problem with slide bit. The newer one has a longer tang that is supposed to prevent that. That being said, I have a pretty high grip and I don’t suffer from slide bite as much as slide burn. After enough rounds the slide wears a channel in the web of my hand, but you can’t be a...