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I have some gen 2 pmags they typically are 10 or 11 bucks for the 30 round. I am not sure they make any 10 or 20 gen 2 anymore.

The gen 3 seems to run 14 to 18 depending on the round count, windowed/nonwindowed, and seller. I have a 10 round gen 3.

I think the difference between gen 2 and gen 3 is mostly a change in looks and change in internal structure slightly. They come with a cap for the top the mag and can have a window to see the rounds in the bottom. They also just come in black or sand color. They say they provide the sand color so that you can dye it to any other color you might want.