For those here looking for information on building an AR here's my latest build and cost (I watch the sale pages on PSAs site, prices reflect what I paid at the time, not what they are now):
PSA Premium Upper: $279
PSA Lower (this is the NOBAMA one, standard blem lowers are $59) $120
PSA Lower STR Build Kit ($125)
Charging handle: $17
BCM BCG: $150
15'' MI Gen2 Rail: $170 (LE/MIL discount price)
YHM Low Pro Gas Block: $30
Total cost: $891
All prices are OTD. I had the sights sitting around in my parts bin but a set of MBUIS sights is $80-90. I'll also be selling my original front sight for $15-20. The big advantage to building it yourself is building it to your specs.
If ya'll have any questions; let me know.