Aero precision m5 .308 mid length carbine upper - Aero Precision M5 12.5in .308 CMV Complete Upper Receiver with Flash Hider w/ATLAS R-ONE Handguard

This complete upper was in stock, priced appropriately, and shipped promptly. On the outside it looked great. However when I ran a patch through the barrel it was full of rust. It took several brass brushings and patches to clean up the barrel. I am not sure how long this complete upper sat in a damp warehouse before it was sent to me, but the inside condition of the barrel was not good at all. Fortunately I purchased this upper for CQB and not looking for accuracy past 100 yards or it would have been returned as damaged upon receipt.