A few years ago I was walking the aisles of a big gun show when I spotted a seller with a stack of orange Thermolds. All the other magazines at this show were flying off the table, but no one would touch these.
I'd never seen any before and didn't really know what they were, so I asked. I think everyone at the show must've tought they were toys or for training, but after looking at the feed lips for 3 seconds I knew what they were.
I bought the whole box for $2 ea.
Being the lazy sort that I am, I used a Dremel and gave them a few strokes with a file as a clean up, using a black Thermold as a guide. They all work flawlessly.
I get a few weird looks at the range, and sometimes people will actually come over and ask. When I tell them they usually laugh, and then I let them empty the odd orange mag. Then they smile.
[img]http://www.mindspring.com/~steel_rat/m4.jpg[/img]
[edited to add picture - yeah, it's a crappy digital camera, but it was cheap. [:D] ]