Okay, another noobie question: ( sorry if this has been answered earlier)

I seem to find two types of 15 round mag pouches. One has the large rear opening with a single snap. This seems to be the one that fits over the butt stock. The other type have what seems to be two belt loops.

My question(s) is this:

One the butt stock version, what is the snap for? And what was the original belt used for this pouch? On the two belt loop version, what belt is used?

I've been trying to find pictures of pouches on belts but haven't found any yet.

Thanks for your response.
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