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"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
OP, How about taking another picture with the upper resting on it's sights so that everything is lined up vertically instead of the photo with the upper angled? Then you/us will get a better view of what is off kilter. If your BCG is locking up correctly as you stated, then as mentioned before, it's most likely the barrel extension is good and the M4 feed ramps are off. As Toddler stated, from your only photo it sure does look as if it's the receiver at fault. You can go to the range and test fire. If no problems occur, leave it alone and run with it.
okay this isn't perfect but as far as I can tell it seems to be the upper
I'd get a BCM or MUR upper and swap it out.
"You people have too much time on your hands." - scottryan
Looks like Colt should replace the receiver for you and get you one that lines up with the barrel extension. Personally I would exhaust that route before having to pay for a replacement receiver for a manufacturers goof.
Now that we have a better pic of the issue, I think a new upper would more than likely fix it. I would still return it to the guy who sold it to you unless you got such a good deal that you are willing to spend another 85.00 on an upper and parts.
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