That was some shot
that killed Stuart Brown with a single round. Granted, it came from a high-powered rifle but still . . . what are the odds of ONE BULLET causing NEAR-INSTANTANEOUS DEATH and NOT be a head wound ? That takes some skill.
BTW, when did Robert Bingham, a former soldier of no known repute who's been working in the private sector installing video cameras, become such a sharpshooter ? I suppose you could argue that he always was and that the series just never mentioned it. (Although it makes it even more unlikely that Stephen Collins just happened to bump into a former acquaintance that just happened to be a marksman. However, even if you grant this, how did Bingham maintain his skill for however long he'd been out of the military, since gun ownership is highly restricted in Britain ?