Adams Arms 5.56 Carbine Evo Ultra Lite Competition 16" Piston Upper UA-16-C-EUL-556
The New Adam Arms 5.56 Carbine Evo UltraLite Piston AR-15 Upper is the ultimate 3-gun competition upper and the lightest gas piston system on the market! Weighing in at only 4.2lbs, the ultra lightweight design makes this a perfect fit for the serious shooter, a 3-gun competition shooter or the AR-15 enthusiast.
Adams Arms Piston AR Upper Receiver Features and Specs (from Adams Arms):
Take a look at the review done on Defense Review:
This is a complete upper which includes a bolt carrier group and charging handle.