A friend and I discovered we couldn't get the receivers back together on the KA M4 unless we did the motor grip screws and body pins in a certain order. I forget which order it is now, but if you're screwing down the motor grip first and then doing the body pins after and you're having trouble with the body / selector switch / etc coming back together, try changing the order of operations.
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"Mah check"
Now you know
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