My Sport I found was slightly canted also when I had sighted it in for the first time. Well that was all corrected by chance when I decided to added a YHM-100 upper. I noticed the canting was gone. I believe the indexing cut on the Sport upper was off. There was also no play between the barrel extension indexing pin and the upper cut out on either uppers. The canting really did not bother me. I just accidentally corrected it with a new upper.
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