The Classic Army M4 KM12 Skirmish AEG Dark Earth (tan) - NF004P-DE is a great starter airsoft gun with a keymod style front rail system.
The M4 KM10 Nylon Fiber is Classic Army's entry level carbine that's a little longer than the KM10. Utilizing Classic Army's nylon fiber allows for a lighter weight platform while ensuring playable durability in a cost efficient package.
The M4 KM10 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 nylon fiber 12 inch long Keymod (sides and bottom, picatinny on top) 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 inner barrel, and a quick change spring system. This gun is lipo-ready right out of the box. It will shoot 330-350 fps using 0.20g BBs out of the box. A rate of 900-1000 rpm using a 9.6V battery (nunchuck style in rear crane stock) with its 18:1 ratio gear set. It has a quick change spring system so that you can quickly and easily upgrade or downgrade your spring to change the power level.Note: Includes 9.6v battery and charger, and hicap M4 magazine.