I built the ar with the kit srews and no problems either, ok I tapped them first, which you really shouldn't have to do, but that is a problem with the cheap srews and not heap plastie, it is far FAR better than the DF-03 plasti, and after being an owner of Academy stuff.... it is far FAR better than that too. At least I know all the metal bits will last and not munch itself.
As for the Diff's, I never even noticed an issue, I did glue the diff rings to the plastic holders and to be honest, I am surprised that they have lasted. I did have a noise oming from the car, but that was lack of grease on the driveshafts, once greased they were fine.
For the price, you really can't complain with it, in fact you get a lot of kit, ball diffs, ballraces through the drivetrain, 48dp spur, shims for the rear suspension....
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