CountryBoy19
Grandmaster
If you go the AOW route definitely go with the above suggestion of finding a SOT manufacturer to build it and F4 to you.
A small tid-bit of info just occurred to me that may be helpful if you have an SOT build an AOW for you. It's not very widely known so I wanted to put it out there. If you own the Title I firearm (normal rifle etc) and have an SOT build it into a Title II firearm it can be F4 transferred directly back to you even if the SOT is out of state. Very few people know about that.
IE, If you buy an out of state NFA weapon you have to have it F3'd to your in-state dealer than he will charge a transfer fee and F4 it to you. This adds to your time and cost. If you owned the Title I firearm and had it in your position before having it built into an AOW you can skip the in-state transfer; the out-of-state SOT can F4 it directly to you.