To add on to AC's comments on Stickman's equipment:
Extra Mag holder: Redi-Mod (Blue Force Gear's modified Redi Mag).

Flash Hider: Looks like the AAC Blackout.. which probably is the other name for what AC called it.

Stock: Magpul UBR

BUIS: I'm not sure.. but you can tell the front and rear are fold downs. The front is combination gasblock & folddown front sight. The rear fold down.. I keep wanting to say Midwest Industries, but don't think that's it. Probably can find out what they are in Stickman's post on the different front & rear BUIS thread he wrote.. lots of good pics

The trigger is a Geissele.. great trigger.. personally own 3 of them.

Charging handle looks like a PRi Gas Buster.

Hmm.. Don't know who manufactures the upper.. top rail looks funny to me.. like the rail was added on top of another?? Definitely doesn't look like a monolithic rail..