Heckler-Koch is, of course, my preferred company. Which gun, though? Probably the G-11 or PSG-1. The G-11 for no other reason than if any intruder saw it pointed at them, I think they'd leave IMMEDIATELY. The PSG-1 because it's perfect for hunting, long shot, and works as a self-defense weapon just fine in a pinch. Oh, and because it's in Metal Gear Solid.