Before doing anything, take a BCG and run it in & out to see how the bolt lugs line up with the barrel extension. If it fits fine, it may be possible to fix the ramps.
Nobody knows if Colt will warranty the upper or even work on it except Colt. We've seen many fine examples of manufacturers stepping up and taking care of their customers. Contact Colt and ask them what your options are. They might pleasantly surprise you
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