Patience, Patience, Patience, Patience, and the PATIENCE!
We found the easiest way is to go through Silencer Shop Kiosk.
It is exciting getting your first suppressor (beside the extreme cost and TAX. If they were legal like a firearm the prices would be sooo much less-most everyone would own at least one)
Buy the Suppressor you like, fill the paperwork out, pay the $200 Tax and then FORGET ABOUT IT!
One day to your surprise the store where your suppressor is in jail at will call you stating it's time has been served and you can pick it up!
Done this many times. Best way is to setup a "Trust" to begin with and then all suppressors, SBRs are a lot easier.
Best of luck
PATIENCE!
Len & Jill