I'm actually working on a couple right now:
Colt LE6920 built lower
Bison Armory 18" 6.8spc barrel
YHM freefloated fore end
PSA stripped upper receiver
Burris PEPR with Vortex 4.5-12x50
wife's rifle:
PSA stripped lower
PSA LPK
PSA M-4 stock kit
PSA stripped upper receiver
AR Stoner barrel
Vortex Strikefire
Budget range toy:
ATI Omni built lower
AR Stoner barrel
PSA stripped upper
Hogue fore end
MagPul BUIS
Don't be afraid of these rifles. They are quite easy to assemble. Think my next upper build will be a SBR