ps90 sbr process

Excuse me if this is retreaded. I got a ps90, and i want to send it to Tros to sbr it. I am in Michigan. What is the proccess with the tqc stamp to get this done? I want to have them engrave and cut it down. Do i send it to them, pay and fill out the tax stamp after they complete it, it gets approved and they send it back?
Thanks