PMAGs - where to buy?

why would it not work? you just stack them a bit more to the right or to the left, as it would be in a normal double stack colon.

To have the bolt scoop from a double stack mag you need a certain width between the feedlips. The single stack mag would not be able to retain ammo as the distance required for the 556/223 exceeds the width of a single cartridge. Either all the rounds would flop out of the mag under the spring pressure or the bolt would get hung up and jammed on the single stack feed lips. Either or.
 
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