I run a Canadian CS fixed stock with a Colt LMG Hydraulic buffer and green spring on my Colt M-16A1. Upper is Colt fixed field sights with deflector and Colt LW 1:7" twist 14.5" barrel and old style CAR handguards. Optics is a 2X Compact ACOG.

The setup is terrific: very lightweight and extremely controllable on full auto. 2-3 shots bursts are a piece of cake and even longer bursts are fully controllable.