Miscellaneous Unit Airsoft shows an M16A1 AEG made by E&C with special Korean marking (Colt Model 603K). This features a full metal receiver, barrel, flash hider, and sights, paired with a durable ABS plastic stock, pistol grip, and foregrip. Its quick-change spring gearbox version QD 2.0 allows for easy spring upgrades, and it comes with a high-capacity magazine. It has an adjustable hop-up unit and 8mm bearing gearbox.