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Wow. I did that on my C8 as well. I found that I couldn't seem to adjust the motor height properly to minimize gear noise. After thinking about it for a while, I put a couple of shims on the bottom axle of the bevel gear to ensure the ARL would always catch properly, and no shims on the other side. It allows the bevel gear to move side-to-side a bit, which still meshing with the spur gear correctly. And it now the pinion and bevel gear mesh perfectly and it reduced the gear sound in my gun significantly.
I wasn't sure this was a correct way of doing things, but figured I'd try it out. I have some spare gears kicking around if stuff went wrong. But now after 2 games with my trusty carbine, it's performed admirably and still sounds nice and smooth. I'm glad to hear that I wasn't totally out to lunch trying this technique that seems quite contradictory to the regular views on shimming...
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