good question for fun. well if he is like the guys who robbed the bank in L.A. in the early 90's, then your screwed unless you get ahead shot, but if its some guy with light armor, or no armor, and i had my GLOCK 26 with 12 round mags, i would just aim for the upper area of his back, and empty the clip, or keep firing till he drops. and then grap his ar15, open the top and steal the full auto sear!!!!!!!