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There are 2 things that stop the KA receiver from going that last 1.5mm.
1) What Stealth Alluded to, you need to "pinch" the upper receiver near the back so that the tabs will slide into the lower. Just use your fingers for this, not vise grips. These receivers are brittle.
2) The gearbox has to line up properly with the hopup so that the hopup kind of goes into the front of the gearbox a little bit.
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