Originally Posted by Conker
I'd have to dig a bit, but I remember seeing pictures of Force Recon operatives in training having extended 1911 mags in a drop leg mag carrier.
MFR get issued 8 round McCormick, Wilson or Sprinfield mags (which are identical in size to the 7 round mags). Some also carry some McCormick extended 10 round mags. (Haley was with 4th Recon)