I was thinking about that too. Are the BCA barrels nitrided though?That link I posted about the 7.62x39 Bear Creek/AR Stoner uppers also makes me wonder about the 7.62x39 upper that PSA sells. It's got the same specs as those other two and they charge $250 for it complete or $150 minus BCG/CH
http://palmettostatearmory.com/psa-pa47-16-7-62x39-upper-w-bcg-and-charging-handle.html