Quote:
Originally Posted by ccyg8774
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, and 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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I almost always have that happen when I take my upper off. It is a pain but I don't think there is much that can be done. It just seems to be the way the spring pulls the ornament plate that makes it pop out of the guide.
It just takes some messing with to get everything back together.