The M4 RIS EC2 Nylon Fiber is Classic Army's entry level carbine.  Utilizing Classic Army's nylon fiber allows for a lighter weight platform while ensuring playable durability in a cost efficient package. 
The M4 RIS EC2 Nylon Fiber features a high rate of fire along with a 300rd high capacity magazine so you can put more BBs on target faster than you can count.  It also features a quad rail system for attachments of lights, lasers, bipod, or forward grip.  Front and rear flip up sights are included with plenty of rail space for you to mount a scope.  The quick change spring feature allows you to change the power of the gun quickly and easily (upgrade spring not included) so you're ready for all environments and ranges of play.
Internally, the gun has a 9mm bushing gearbox, inline mosfet protected trigger contacts, 6.03mm tightbore barrel, and a quick change spring system.  This gun is lipo-ready right out of the box.  It will shoot 330-350 fps (375-395 fps for Canadian versions) using 0.20g BBs and 900-1000 rpm using a 9.6V battery.  It has a quick change spring system so that you can quickly and easily upgrade or downgrade your spring to change the power level.
Battery and charger included.
Overall Length
690mm-775mm (Adjustable Stock)
Overall Weight
2410g
Inner Barrel Length
280mm
Inner Barrel Diameter
6.03mm
Hop-Up
Adjustable
Piston Material
Heat Treated Polymer
Gearbox
9mm Bushing Metal Gearbox with Quick Change Spring System
Gearset
Wire Cut, Steel 18:1 gear ratio
Trigger
High Heat Tolerant with Inline Mosfet
Rate of Fire
900-1000 rpm with 9.6V battery
Velocity
330-350 fps with 0.20g BBs (375-395 fps for Canadian versions)