Quoted:
Make a Banshee that runs Beretta 92/M9 mags?
Seems like the operating system of the Banshee is the way to go.
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I highly doubt they would do that....but if you really wanted to run Beretta 92 mags bad enough, you could use a Stern Defense Beretta Mag block - my buddy has used the Stern Defense Glock mag block and got it to work with the CMMG system already, but now the mag release is relocated.