So, after a little over a year of thinking, looking, and asking questions, my AR pistol build is 99% complete! A big thanks to Ken from Atomictactical, he answered all manner of questions(when he should have probably just told me to check google...), finally building the upper for me.
The second pic is how I got it from Ken, and the first pic is of it assembled.
Parts used:
PWS lower (blemished)
Spike's upper
BCM mod4 charging handle
VLTOR CASV-MG handguard
A2 flash hider
YHM 10.5" chrome lined bbl
Assorted lower parts, but mostly DPMS
ACE pistol buffer assembly
Magpul trigger guard and MOE grip (Foliage green)
EoTech 552
Streamlight TR-2