This has been a work in progress for about 6 months but Sunday I finally had the time to giterdun. The barrel started out as an original 20" Bushmaster that I cut down to 16" and threaded (the hard way) for the 11/16"x24 TPI flash hider. Aero stripped upper. A2 FSB that is attached with #8x32 set screws. Triangle handguard cap attached to FSB with #10x32 screw. Carbine length gas with AGB as the barrel has a .093" port. I opened up the ejection port with a (ahem) "rotary tool" and it turned out great, all you need is a steady hand.
Was a long day, the Guiness hit the spot:
Under the hood:
Oops, almost forgot the sling swivel:
The lower will be next, already have the striped Aero, A2 stock assembly and LPK. Just need to find another empty day.
ETA: Barrel size 16" now.