G&g m4 ras combat machine electrci gun (black)

electric model with semi/full auto selective fire
8mm reinforced gearbox with 1j spring installed
retractable stock and 14.5 inches metal barrel
reinforced nylon fiber body,stock and handguard
crane battery stock for separate or lipo type battery
450rd magazine and 1000bbs are included
Weight 2320 g 
Length 750/830mm

Technical data
-reinforced 8mm gear box with metal bearing
-1 joule power tempered spring with seal nozzle
-steel gears with integrated delayer cam
-reinforced piston with polyamide piston head
-hi torque motor long axle
-adjustable hop up with 363mm inner barrel