To get a stamp you need the serial number of whatever it is, so it needs to be bought and paid for. The first step is buying the nfa item, then shipping it to a local fll dealer with a class 3 licence, then fill out the form 4 paperwork (either as individual or trust) and have the ffl holder fill out their portion, and finally mail it in with $200 in check or MO. Once the stamp comes in, you can then legally take possesion of the nfa item. Read through the From 4 paperwork to understand what you need, its pretty simple. I just used quicken willmaker for the trust. I did hear from a lawyer friend that a trust is not technically created until there is something in the schedule a, so my first item is just a $2 bill with the serial number. That way I could send the ATF a schedule a for the first nfa item I got.