- Drop-In design- suitable for Version 2 Gearbox (e.g. M4 , M16 and etc)- Rear Wire- supporting power voltage between 7.4v - 16v- newly designed active braking system that accurately postioning gears and reduce motor abrasion - Quick trigger response without delay- Stable single shot , turbo shot , 3-5 bursts- auto magazine prime can be switched off- short circuit and stall protection - adapt various motors including ordinary and strong magnet Manufacturer : BIGRRR