M4 4" MRF
(Full Titanium Standard Torque Gear Set  Gearbox)

Specifications:
Hop-up : Original One Piece Hop-up Chamber
Gear set : Titanium Gear
Magazine Capacity : 300 Rds Magazine
Overall Length : 508~589mm
Inner Barrel Length : 120mm
Muzzle Velocity : 280~320FPS(85~97MPS) with 0.2g BBs
Battery : 7.4 ~ 9.6 V
Weight : 2.4 kg  (without Battery and Magazine)