Specna Arms / Rock River Arms Licensed CORE Series M4 AEG (Model: M4 Carbine Slim M-LOK / Black SA-C14) Airsoft Sniper Part Red Piston Full Metal Teeth

Red Piston Full Metal Teeth

MAX PREASSURE IS 200 PSI

Unique to this hopup design is a latching system which engages when the magazine is removed to retain the last fed BBs preventing them from falling out like standard hopups

Battery and charger are NOT included

OPERATION: SPRING

Specna Arms / Rock River Arms Licensed CORE Series M4 AEG (Model: M4 Carbine Slim M-LOK / Black SA-C14) Airsoft Sniper Part Red Piston Full Metal TeethFeatures 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