I had a different issue when assembling my KA M4.
To put the upper receiver back you need to pull the bolt handle to the back at some point, but that can easily pull the dummy bolt out of its "rail" that allows it to slide back and forth, then the dummy bolt will be out of place, and stays on the back, preventing the upper from going into the place for few milimeters.
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Last edited by ccyg8774; March 18th, 2013 at 23:12..
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