How about the Keltec SU16... takes AR mags, folds in half, lightweight, cheap'ish... fits in a small suitcase, large capacity, good aftermarket.
You could also make a good case for the Keltec Sub2000... .40cal 180gr Hydrashok out of a 16" barrel is no joke. Carry a G23 as a primary and only need one kind of mag.
You could also make a good case for the Keltec Sub2000... .40cal 180gr Hydrashok out of a 16" barrel is no joke. Carry a G23 as a primary and only need one kind of mag.