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The 'old' mambas boy wasn't a sniper weapon AT ALL (c'mon a high ammo fast-fire rate weapon a sniper one?!) it was way too OP as well. You could easily get a 10 kill streak without even trying... I couldn't have said it better myself then @eLymeiano did.
Totally agree with his comment.
Crossbow isn't a sniper ? Neither is BlowDart ? And last time I checked, Art of War doesn't lock on so I don't believe that is either. And are you going to try and tell me AoW and BlowDart aren't OP ? Because they are. And you could do the same with any of these "non sniper weapons"