The AR4 much like its other Skirmish Series guns is built around a durable nylon fiber body. Inside you have an upgraded version 2 compatible gearbox that has a host of features found on guns that typically cost twice as much. You have 9mm bushings with a quick change spring guide. The fire control and trigger system is the ECS system which is a programmable microswitch trigger and MOSFET. You also have a torque motor inside the upgraded grip which has a hinged base plate.
Outside of the gun is what makes this gun totally different from the other Skirmish Series rifles. The front is super short with a free floating handguard and the stock is a compact collapsible type. This stock has a very small footprint making this rifle very compact. The buffer tube area also houses the battery so you can have a very short rifle without the annoyance of figuring out where your battery should go.
Also worth a mention is the fact that Classic Army have incorporated a quick change spring systems and programmable fire options.
Manufacturer: Classic Army
Fire Selector: Safe, Semi, Full auto
Magazine Capacity: 330 Rounds
Powered By: Electric
Exterior Construction: Polymer receiver, hand guard, grip and stock
Internal Construction: Metal internals
Hop Up: Adjustable