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gotm4
I you have the circular wear on your buffer it's typically from the rough finish or a sharp edge of the carrier, almost always there's a sharp edge at the bottom groove. If you're buffer is getting chewed up on it's outer edge really bad (looks like someones beat it up with a chisel and hammer) it could be that the buffer detent hole in the lower receiver is machined too far rearward which doesn't allow the carrier to push the buffer off of the detent when the upper is assembled on the lower.
Felt of the rear of the carrier tonight, could feel no burr at all, including the bottom groove. However the edge at the groove was sharp but did not appear to have and burrs where it would contact the buffer face.:confused:
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Generally we see this with cheaper buffer bodies not made per the mil-standard. Very few companies use the mil-spec bodies. The short list as I know them:
Colt
LMT
BCM
G&R
Stag
I am sure there are others, but these are the ones I know for certain.
C4
I tend to lean in this direction at the moment, but am not totally convinced as yet.