I saw some at a gunshow. I think the maker is Eagle or something. Are these any good?

Do you really want to trust your life to a plastic mag?

Nothing's wrong with plastic, luddite. There is, however, a problem with Eagle brand magazines. Run away fast.

Tell that to the soldiers who trust their lives to the AUG and Sig 55x mags.

Plastic breaks, aluminum bends...both have weaknesses.

So, let me turn that around.  "Do you really want to trust your life to an aluminum mag?"

I have one of the smoked Eagle mags.  Admit it.  Most of the people who buy AR 15s do it for the novelty of having one.  The same goes for the clear Eagle mags.  Ignore all of the "Soldier of Fortune, Jar Head, hoping for SHTF" types who spew nonsense like "trusting your life to this and that.  Get yourself an Eagle mag and have fun!

Never used an Eagle have usded the ramline combo mags and they are fine for range use but there are reasons SWAT and SF dont use them.

SorryOciffer

If you aren't carrying it into combat it could be fun to play with. I don't like plastic mags. We used to have the occasional Thermomelt(Thermomold) pop up in one of my units. They usually didn't last long. The lips break off.

Eagle AR mags, and Ramline pistol mags both have  what are called "constant force springs".  These are strips of metal that coil up.  They run down the side of the mag, and roll up under the follower.  There is a lot of friction between the coiling strip and the follower.  Another problem is this:

In a normal magazine, where there is the most ammo loaded, the spring is highly compressed and exerts the most force.  Good!

In a mag with constant force springs, when there  is the most ammo, and thus, the most weight pushing down, the spring still has the same force as when almost emplty.  These springs have difficulty lifting all that ammo, and when combined with the friction, the problem is worse.  

If you download them somewhat, they work smoother.

Duh, I would rather have a USGI mag.