Re: SBR ?
Once you form 1 a lower you can have as many uppers as you want provided the original started caliber and length is still in your possession. I have a 5.56 SBR with an 11.5bbl for an overall length of "x" (sorry dont know it out the to of my head). I can get a 300blk upper with 9bbl and be golden since I still have the original upper.
To the OP, I bought a stripped lower, had it engraved then sent the paperwork to the NFA. I went form 1 as an individual. Its going to take time, I went from check cashed Nov10 and pending shortly after, with an approval in Mar11. Unfortunately your 200 wil be tied up, theres nothing that can be done. While you are waiting for your stamp you can still use the lower but it must be with a 16 inch upper. Absolutely do not assemble your shorty upper prior to getting your stamp. the way I look at it is if you buy a factory SBR your dealer keeps it anyways till you get the stamp.
It sounds like you've made up your mind to do an SBR, just have patience and enjoy the time waiting.
