Is the std ak v2 gearbox the same as the std ak v1?

the std ak is really awful! the gearbox is poorly made, need a new gearbox to replace the one in std ak v2. can v1 gearbox suit it? or other brand’s gearbox could do the substitute?

what seems to be the problem in it?

gears are missing in the gearbox

Now that’s different :astonished:

not quite sure, but’s detached from gearbox anyway, a customer need a whole new gearbox as a replacement

finally, find the std original one for replacement