We've had the same thing here in Minn for years. I can ship in-state just about anything. It's when I ship out state I have to jump hoops,, not for state regs or ffl for BP guns, but for the shippers! USPS or UPS or FED-EX or etc,,
So I Keep It Simple (S). I'm not shipping a "Firearm"! it's an antique replica, or machine parts, or an antique. I don't know what the in-line guy's do or how dealers with in-lines do it. Gosh private parties should deal with private sales right?
K.I S.S. Be aware,, think first. verify your buyer, verify your seller, proir to the transation, safe, smart and simple.
I don't think "terrorists" are going to arm themselves with mutilple cylinders for colt peace makers or even "pattersons" heaven forbid. Are there aholes out there that could? Sure. Could they wreck things for us? Sure.
But I'm still carefull when I walk across the street to pick up my mail everyday too,,