[BattleRifleG3]

The intricate stampings are military. The ones that look like sheet metal cut with tin snips and bent with pliers are the aftermarket ones. I could tell you if you sent me a link. The military ones are pretty much always lighter.

[Pred]

http://www.cheaperthandirt.com/MAG307-1620-1318.html

[Mooseman684]

Those are aftermarket Mags ! Stick with 20 rd Mags !

[Pred]

Ok, thanks Mooseman.

[BattleRifleG3]

Wish the picture were more clear, but for that price I suspect they are indeed aftermarket. The military 30rders are not so common and are probably 2-3x as much, which isn't terrible, but when 20rders are in the single digits, I don't find the 30s practical. I also don't like a mag that hangs down too far, 20 is about perfect for me.