http://www.shottist.com/beltfed.html
I'll take a belt fed AR-15 chambered in 308 with an aimpoint, laser sight, and silencer (so I don't go deaf). That solves the problem with being bitten between mag changes.
That along with an ice cold Pallet of Miller High Life and a box of jumbo wing-dings, crate of marlboro menthols, bottle of Johnny Walker, box of beef jerky.. man the list just keeps getting longer.