EMG Max Performance Gearbox Spring for Airsoft AEG Rifles (UK-SP85 / Grey) laser beam The rifle's gearbox is the

The rifle's gearbox is the M4 Proline Version 2

Magazine: 130 Round High Speed Mid-Capacity Magazine (Compatible with most M4 magazines)

Operation: Gas

Retractable LE stock

Pistol uses standard green gas

EMG Max Performance Gearbox Spring for Airsoft AEG Rifles (UK-SP85 / Grey) laser beam The rifle's gearbox is theFeatures Ultra durable steel construction Low tension coil design is optimized for long lasting strength Designed to last thousands of rounds without any compression or deformation Reduces stress, wear and tear for your gearbox due to less compression force at rest Shortened overall spring length allows easy installation and easy maintenance Color coded for quick identification of power rating Manufacturer: EMG Specifications: Length: 100mm Velocity: