Good call. I will try that first.
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If I have a new carbine with tight upper to lower fit, I place the bottom of the pistol grip on my workbench and press down on top of the rear of the carry handle to get the rear take down pin to go in. A little dab of lightweight grease on the rear take down pin helps. I push down on top of the carry handle and use a delrin pin to push out the take down pin for disassembly.
I would never pound on anything with a hammer to get the rear take down pin to go in.
My advise is sell the offending part and don't buy from that company anymore. Been there, done that. It's what it finally took to get me to stop drinking Noveske Kool-Aid. :cool:
They tested the upper with several other manufacturer's lowers (but not Mega) and the upper fit fine. The upper was sent back to me (waiting for it to arrive) before I could respond to their email reply regarding the tests.
I would stress again that I have 2 other MUR-1A's that fit all 3 Mega lowers properly. Maybe I should have sent the Mega lower as well so that they could see the issue firsthand, but I didn't know if the lower would require FFL transfers.