And to beat a dead horse:
Friend's gun failed in game, took a preliminary look, and apart from the obvious pinion gear having slipped down, I also noticed a ridiculous amount of backlash in the gears.
So after taking it apart, issues are as follows:
-gears have excessive lash
-bevel gear was shimmed to far into the right half of the shell, causing it to wear and grind into the shell
-bevel gear axle is too tight of a fit into the right bearing, causing stress in the bearing and wearing it out (the left side bearing is fine, axle is perfect fit on that side)
-excessive lash from the sun gear to the sector
-excessive angular lash on the sector, as a result of the planetaries not being tight enough (side to side lash is expected, but not angular)
-axle of the sun gear is a bit loose in the gear
-more wear than I'd like to see after this many rounds on a sector gear
-bearing cap for the sun gear, again, is way too tight for the bearing, has crushed the bearing, and the bearing is worn out
Given the light wear between the bevel and sun gears in a gearbox with this much lash, I'd assume there haven't been many rounds put through it.
Just waiting to hear back from the owner to see if he can put date on this thing
Video of the lash here
https://www.youtube.com/watch?v=yhdb...ature=youtu.be
