The M16 is the precursor to the infamous Colt M4. It saw service during the Vietnam war, and has had many upgrades over the years.
This variant has received Colt's official seal of approval, coming complete with licensed trademarks through Cybergun. It is a full metal gun (metal receiver, handguard, outer barrel, trigger, bolt stop, charging handle etc.), of realistic weight, with excellent performance. It is a more modern variation of the M16, including a full length Keymod handguard (including keymod rail adapters), 20mm RIS/RAS top rail (rather than the built-in carry handle), and flip up BUIS (back up iron sights).
Internally this replica features a version 2 quick spring-change gearbox, perfect for maintenance or fine-tuning performance. You also get a rotary hop up chamber as well as a 6.03mm Tightbore barrel, which considering the length of this piece, is a nice upgrade to have!
Best of all, this package includes battery and charger, allowing you to get out playing straight away. The battery is stored in the composite full-stock at the rear of the gun, which in addition to being iconic, allows for a multitude of battery options.