Colt 6920 currently sports an Aimpoint not pictured.
Colt 653 clone built on NDS repo lower. Everything except the LPK is vintage Colt parts.
Top is a recent build. Armalite upper/lower, Sabre 14.5" barrel perm phantom, Bravo Company BCG, stock, and lower parts kit.
Bottom is a LMT Defender, two stage trigger with a Trijicon Accupoint in a LaRue mount.