6.03mm Tightbore inner barrel
Pre-upgraded version 2 gearbox
High density polymer construction
Beginners and veterans alike, if you need a lightweight performance-oriented M4/AR-15 platform either to add to the arsenal or as your first AEG, Delta Armory is one to watch! New to the scene with loads of potential, the DA-C04 CHARLIE™ M4/AR-15 KeyMod AEG is constructed almost entirely from strong high density polymer for a lightweight and agile build with an alloy outer barrel to add strength where needed. 
The DA-C04 comes equipped with a KeyMod-style handguard with removable proprietary 20mm rail sections, a 20mm railed receiver ready for a red dot sight or scope, an ergonomic pistol grip styled after one of the most modern real steel AR grips and a threaded outer barrel for your tracer/suppressor needs. 
Inside, it gets even better! The reinforced version 2 gearbox boasts a quick change spring guide, an SHS piston and tappet plate, 7mm bushings and a steel 18:1 gearset. To add some accuracy and range into the mix, the DA-C04 is kitted out with a 6.03mm tightbore inner barrel and rotary HOP-up unit, giving you some of the best internal options pre-installed. If you want a lightweight primary you will never need to touch internally, this is it!