I'm not sure if this has been discussed yet. One of my buddies has a AA .50 Beowulf and it came with a standard .50 Beowulf mag but what we found was that standard PMAGs function perfect but they only hold 15 rounds . So my question is can magpul legally make .50 Beowulf mags the same way they make regular PMAGs and just mark them .50 Beowulf ?