Mine looks rough as in the finish wears off. I don't see gouging or steel/aluminum shards or flakes in my receiver well.
I'd like to hear the "official RA response" too. But hard to compare to an AR. Ar and M16's do not show much wear for they do have tighter tolerances on the BCG bearing surfaces. 300 rounds won't show much, if any wear. This helps attribute to smoother operation, but fails when sand and dirt gets into this area.
The XCR, like the Ak, looks to be "looser". Ak's will show more wear but inherent to its design does not intefere with operation. An AR showing that amount of wear will indicate something out of specs.