The Great Krytac DMR Fiasco

READ THIS BEFORE COMMENTING ABOUT THE GEARS!!

I've fitted plenty of gear sets to krytacs & never before have I found that the ORIGINAL gears were grinding on the casing.
I tend to not explain myself clearly in the vids as my mind is on the task & I'm trying to problem solve & explain myself at the same time, I have a mohawk so I'm not all that up there in the brain department.
So! - the raised areas SHOULD push the gear away from the casing but you'll see that there is radial scratching on the casing - that should be impossible which is why I jump from crushed gears to bowed gearbox & back again, why was there radial scratching on a gearbox casing with stock gears & why where they not moving freely? It was a nightmare... at 1:32 you can kinda see the scuffs, it should be impossible so it's like the factory bowed the casing outwards & then attempted to rectify it but went too far.
Another tech had previously worked on this gun but again, that wouldn't explain the scratches & the gears we're still stock PLUS I know the tech who originally worked on the gun & he's sound as fuck, skilled guy.
There was also red & blue thread lock on the bushings inside & out - who in their right mind would do that?
This is a factory fuck up.