Quoted:Have a couple more questions. If the gun is on a form 4 out of state, that is two tax stamps to me correct? And form 3 is tax free for the first stamp? How does a gun get on a form 3? Is that a SOT thing?
It doesn't actually matter what form an NFA firearm is "on" - it matters the current SOT status of the seller, the buyer and all the intermediaries. If the seller is a current SOT, then regardless of whether the NFA item is "on" Form 1, Form 2, Form 3, Form 4 or Form 5, it can transfer to another SOT tax-free via a Form 3, or tax-paid to a non-SOT via a Form 4, or tax-free to/from a gov't entity on Form 5.
However, it's generally a shorthand to say that if a gun is "on" Form 3, that means the initial transferror is a SOT, and will be able to transfer it tax-free to another SOT via Form 3 for the first transaction after the sale.
In the case of your specific question, the firearm appears to be privately held (non-SOT initial transferror), and in another state. That will require two tax-paid F4's to get into your hand, if you're not an FFL/SOT yourself. The firearm can either come directly to an FFL in your state (SOT or non-SOT doesn't matter), on a tax-paid F4, then to you from the FFL on a tax-paid F4. Or, it can go to a SOT in the seller's state on a tax-paid F4, to a SOT in your state on a tax-free F3, then to you from the in-state SOT on a tax-paid F4.
Obviously, if you've got an in-state FFL (with or without SOT, though a SOT might help the initial F4 clear more quickly), who will accept a direct transfer from the out-of-state seller, then do a transfer to you once it's in-state, that will require the fewest forms, and shortest wait time, but still $400 total on two tax-paid Forms 4.
Second, I see a lot of deals require 100% cash up front, do people actually do this? Seems a bit much to hand over the full price to a complete strange, esp one of out state, to take delivery in 3 months plus.
Many sellers do want it all up front now. You can say no, and pass on the buy, but most transactions I've handled in the past two years have been 100% paid in advance, whether by myself or my customers doing the buying.