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In Short, I'm building my first AR SBR, and have a few questions that I want clarified. I've read and read here and can't seem to find a clear answer.

1. Do I buy the lower, and have it registered just like buying a regular firearm? (Form 4473, IIRC) Yes
2. Then have it engraved and fill out the Form1?Yes,if you don't like the engraving or it gets messed up you are not out 200.00
3. How do I know what the OAL is going to be? I.E, Extended stock + barrel + flash hider. Just rough guess it?I called RRA since I built a rifle with a 10.5" barrel, it is the same OAL as the factory SBR RRA offers.Chances are someone here has built to the same specs as you and could help with that info
4. Can I can build the complete lower before my Form1 comes back?Yes,I prefer to do this prior to the form 1 and engraving in case of an out of spec lower just shoot it with a NON NFA upper until you get your approved form 1 back.


I know these questions are pretty basic and I think I know the answers, but just want to be sure before I do something wrong.

TIA!

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Waiting is the hardest part