I had a day at home with nothing to do, and my back is feeling pretty good ... so I got out in the shop and assembled some AR-15 projects that I've been accumulating parts for.

First up, lightweight AR-15 build on a GWACS polymer lower. This lower is a warranty replacement for an out of spec CAV ARMS lower I've had for a while.
GWACS lower
Lightweight barrel from Alpha Shooting Sports, 16 inch melonited stainless, mid length gas
http://www.shop.ar15hardware.com/556-Nato_c38.htm
Bushnell TRS-25 red dot sight on a UTG riser.

Weight is 5 lbs 15.5 oz, empty

AR-15 pistol
S&W Lower
LMT 10.5 inch barrel
Troy TRX handguard
Noveske PIG flash hider
Spikes Battle Trigger
Palmetto pistol buffer tube
Bushnell holosight

And finally, the one I've been anxious to get finished. I'm short a rifle length gas tube to complete it.

RGUNS burnt bronze receiver set
RGUNS NiB bolt carrier group
DPMS MK12 barrel, 18 inch coated stainless barrel
Troy Alpha Rail, 15 inch
Magpul MOE+ grip
Magpul ACS stock
Larue SPR mount
ALG DEfense ACT trigger group
Weaver Classic Extreme 1.5-4.5x scope