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Specna Arms M4 AEG Rifle FLEX Series M4 M-LOK SBR SA-F03

Specna Arms
SA-F03 Black



Specna Arms M4 AEG Rifle Rock River Arms Licensed FLEX Series M4 MLOK SBR SA-F03

Specna Arms proudly presents the FLEX™ line of replicas. An affordable price combined with an innovative quick spring change system, great performance straight out of the box, and high-quality components make this series an excellent choice for both beginners and experienced airsoft players alike. The Specna Arms M4 AEG Rifle Rock River Arms Licensed FLEX Series M4 MLOK SBR SA-F03 is a versatile and reliable airsoft rifle that delivers exceptional performance on the field.

The receiver, the stock tube with the enlarged SF type stock housing the battery, as well as the front in the M-LOK standard and the pistol grip are made out of polymer plastic reinforced with nylon fiber. Other components, such as the barrel, flash hider, and the enlarged reloading handle, are made out of metal. The replica features markings and a serial number on the receiver, adding to its authenticity and realism.


  • Front in the M-LOK standard for easy attachment of accessories
  • Flip-up sights for quick target acquisition
  • 14mm CCW threaded barrel for compatibility with muzzle devices
  • Fully adapted to work with LiPo and LiFe batteries
  • ESA™ quick spring change system for efficient muzzle velocity adjustment
  • 8mm plain bearings for smooth operation
  • Steel gears for durability and reliability
  • Polycarbonate plastic piston with a full steel jaw for enhanced performance
  • Rotary hop-up chamber for precise BB control
  • 6.03mm Precision Barrel for improved accuracy


Length 700mm (27.56 inches)
Weight 7 lbs
Material Polymer plastic reinforced with nylon fiber (receiver, stock tube, front), Metal (barrel, flash hider, reloading handle)