G&g m4 cannon full metal electric gun (blowback)

new full metal model available
8mm gearbox with 1j spring installed
full metal receiver with g27 anatomic grip
stubby front set with alluminium rail system
detachable pbs silencer installed
rear fixed pipe with bat-10 lipo housing (not included)
450rd magazine included
Weight 2480 g
Length 500/702mm

Technical data
-8mm gear box with bearing and 1 joule spring
-special blowback pneumatic action
-steel gears and reinforced piston
-steel cylinder and cylidner head
-hi torque motor long axle
-hop chamber with 229mm inner barrel