Not gunmetal, it doesn't even adequately represent gunmetal!
The blades are aTitanium alloy and should have sort a dark bronze color (sorry, it's kind of hard to describe).
one of my favorite places-FAS(www.fas.org/man) has an A-10 page.
http://fas.org/man/dod-101/sys/ac/a-10.htm
The pics are down near the bottom.