Originally Posted by
joeyjoe
I definitely want to second the comments suggesting that the depicted wear looks excessive. Looks like that upper has seen multiple thousands of rounds. How does the carrier ride? Does it feel like its binding anywhere when you hand cycle the rifle? Also, i disagree with the assertion that the wear patterns correspond with where the cam pin rides. Though its somewhat difficult to tell from the pictures, it looks like the wear is due to quite a bit of friction between the top two "rails" where the carrier "rails" and the upper "rails" touch...if that makes sense. It may be just fine, down the road, but I've never seen such extensive wear, in that area, in a new upper.
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