The notion of High Risk/High Reward is very much a special weapon characteristic. The sniper rifle has almost no use at close range, the shotgun has next to no range and the fusion rifle has a delay/charge time for every shot. Why not make a gun with limited clip size that specializes in headshots into a special weapon instead of a primary weapon? IMO it'll encourage people to actually use it.
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No way it's underpowered as a primary weapon let alone as a special weapon, a class of which each one will one shot you if used right. I'd be pissed if I was head shot mid rang with a hand gun and die instantly.