I'm glad you posted this. I have been doing research on this very subject.
Here's a couple of links to other forums where this was dicussed in 2007.
http://glocktalk.com/forums/showthread.php?t=802258http://www.thehighroad.org/showthread.php?t=324116&highlight=duplicolorNow this is the same guy in both links on 2 different forums. But I liked the feedback & I just bought a can of this Dupli-Color 500 degree engine paint in Cummins Brown (The 1200 degree stuff only comes in like 3 colors)
I have just degreased 2 AR-15 mags, painted them & they are in the oven as we speak.
IF any cares I'll take & post a pic after they cool.
Mark