6.03mm Tightbore inner barrel
Pre-upgraded version 2 gearbox
High density polymer construction
If military-style M4s are your poison and you need a new platform for close quarters, the DA-C02 CHARLIE™ M4/AR-15 CQBR AEG is a sure choice. This AEG is styled after the CQBR (Close Quarters Battle Receiver) configuration of the M4A1 rifle, a drop-in upper receiver kit issued to Army Rangers, Delta Force and Navy Seals, fitted with a 10.5-inch outer barrel and KAC RAS Style quad railed handguard. 
To furnish the CQBR M4 configuration with some modern ergonomics, Delta has added a gunfighter mod.3 style pistol grip and the awesome Delta Armory battery stock and enhanced receiver, complete with gripping texture on the magazine well and a built-in enlarged trigger guard. As a replica of the Delta Armory CHARLIE™ line, the DA-C02 is constructed primarily from high density polymer with alloy trim parts to provide manageable weight so you can make energetic advances all day long. 
Internally, the DA-C02 is generously kitted out with a tightbore inner barrel, a rotary HOP-up unit, and a pre-upgraded gearbox featuring an SHS tappet plate and piston, 7mm bushings and a quick change spring guide. If you need a solid, lightweight workhorse of an M4 platform with plenty of future upgrade and customisation options, the DA-C02 CQBR is exactly that. A platform this price has no business being so good straight out of the box!