I did not know you (supposedly) needed to register the rifle with the permit you purchased it with (specifically from a gun store, since HPD would not be able to tell if it was a private party sale).
Lady who answered the phone at HPD was not very nice. She was saying that you needed to make a registration appointment FIRST and register your rifle before making an appointment for a new permit. Even if you already had an appointment to get a new permit prior to you expecting to buy a new gun. I told her this system is a mess since we can’t register on time and she said it was not and it is VERY CLEAR. (I don’t know of any instructions anywhere saying that you are supposed to register your rifle with the permit you bought it with) She said the online times open the same time everyday and I should’ve got a registration time prior to getting a new permit. However the registration times would be 3 months in advanced IF I was lucky enough to get one. I was not willing to wait another 3 months to register my rifle and be without a valid permit during that time.
Luckily for me I was able to register my rifle a day prior to turning in my old permit so it worked out but I’m sure others had run into this problem. Open discussion.