The short design also helps this sit closer to the shotgun so it does not affect your maneuverability as much

long battery life and great looks make this weapon and anyone who totes it a winner

efficiency

Adjustable tension to suit the user's preferences

Steel Pinion Gear

Specna Arms / Rock River Arms Licensed CORE Series M4 AEG (Model: M4 Carbine Slim M-LOK / Black SA-C14) Submachine Gun The short design also helpsFeatures Ultra lightweight fiberglass reinforced polymer receiver Licensed Rock River Arms logos Nylon fiber furniture Metal barrel assembly, flash hider, charging handle, and sling swivels ESA quick spring change system allows the spring to be changed without the need to disassemble your gun Rotary type hopup with 6. 03mm tight bore barrel 380 fps spring pre installed from factory, optional 310 fps (M90) spring included to reduce muzzle velocity