If it's shaving from the bottom front edge of the buffer tube it is most likely carrier tilt. There have been many discussions on the different sites and this one too concerning this issue. Some of the SR556's suffer from it and some don't. I would definitely send it back to Ruger, the couple of cases I've seen do not get any better, the condition continues to deteriorate.
"This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?"-Iraqgunz
"You live more in 5 minutes on a bike like this going flat out than some people live in their lifetime." - B. Munro
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