I have a Beretta Neos pistol, and the Carbine kit. I want to assemble the pistol barrel on the shoulder stocked action. I know it needs BATFE approval and the $200 Tax. Does this need Local Law Enforcement approval, on the forms, like a suppressor does? I dont want to start a trust, and my CLEO will sign my forms, but I dont know how a Form 1 is different from a Form 4. Also, does the receiver need any special engravings, or is the original receiver serial number sufficient?