Hopefully I won't catch too much crap...but I can't remember which one is Form 1...is that to build SBR..buy premade SBR..or silencer??..I can't keep them straight
Form 1 - Make and register as if you are going to completely make a new firearm.
Form 4 - Transfer and register as if you are going to buy a pre-made and transfer ownership to you.
There are only selected ones up on e-Forms, for whatever reason.
If your main interest is in a suppressor, I'd direct you to Nate/Lil Jacks Guns. He deals with them. I mainly know the F1 side of things. I have yet to do a F4.
Happy to help. The story in eforms is they are waiting to see how stable the site is before they open the door for form 3s and 4s. Those are the high volume forms and the ones that kept knocking the system out.