What I'm working with.
>4-5 year old D-boys M4 (used 7-8 times, tossed into a closet for a few years, new gearbox tossed in.)
>'AD Classic Front Wiring Complete V2 Gearbox' to replace the stock one.
>9.6v 1400mah Battery.
>Knight arms mid cap mags.
>Stock hop up, barrel, motor, ect.
What's wrong.
-Load mag.
-Fire one round to a mag fine.
-Four to five bb's eventually start jamming up the hop up.
-Air nozzle get's stuck back in semi, returns 30% of the time on full auto.
-Remove upper, exposing the air nozzle, still gets stuck.
What I've tried.
-Reshimming gears.
-Re-greased the whole gear box.
-Changed air nozzle, tappet plate, cylinder set (All stock d-boys stuff, problem persists, in different combinations.)
-Lighter spring.
-Several different batteries.
-Applied silicone oil to air nozzle as a last ditch effort.
Any suggestions? I've disassembled the gearbox 3-4 times so far, and am a little tired of looking at the guts of an airsoft gun
Thanks guys!