Both Thermold and Orlite Mags work well, but in MY AR the orlites dont hold open on the last shot. every other type and brand work, but orlites don't.
I have read that the thermold and orlite mags are designed to be used as survival tools in the fact that they can be put to flame without smoke and used to provide warmth ect.
But then agian, any mag that feeds correctly could be considered a 'survival tool'.
I guess once you heat your MRE with your mag you could throw your ammo at your enemy.