I'll certainly raise a flag on many of the points G makes. But I've been to he Mideast- I'm not certain it's NECESSARILY casting causing ALL the pits in SOME of those rings... it's sand! let me put it this way. If you're in the desert- sandstorms are no joke! They kill people and suffocate horses and all kinds of stuff!! I would imagine that a dak unit? You would get sandblasted!! Here's my experience in a nutshell.... I got sand in places I didn't know I had!
