Colt 6720 with an AAC 51T suppressor mount.
The hand guard is a Troy Delta Rail.
The light is a Streamlight TLR-1HL.
The optics are an EoTech 518 and a 3x Magnifier.
There is a Knight Armament USMC folding rear sight.
The stock, pistol grip and trigger guard are Magpul.
The sling is Blue Force Gear.