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So, if i want my KA M4 to have full auto without the buffer tube and pistol grip wobbling, i need a washer behind the gearbox. Which means the upper receiver no longer fits. Note to self; Stick to what i know.
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have you tried a rubber washer? might tighten things up a bit but have enough give in it to get the two halves together. together.
I didn't have one handy at the time, i spent half of sunday trying to get the bloody thing going. I'm just gonna chuck a G&P gearbox in it i reckon, the KA one is painfully slow anyway.