Good point. If I'm ever in a restaurant that is robbed by men with rifles, I'll check for: bayonet lug, threaded barrel, and grenade launcher. If the robbers don't have all three, I'm going to ignore them and enjoy my meal. Who needs cold food? The rule with pistols is different. It's not the particular pistol so much as the shooter's style that matters. If a robber doesn't know enough to hold it right (see illustration below), there is nothing to worry about.
