Take a loot at its gameplay.
https://www.youtube.com/watch?feature=player_detailpage&v=Jj0CLizTUtA#t=367
It's perk is increased damage from a kill for the next target. Presumably this means it DOES NOT stack.
[b]Edit 1: not fully upgraded, can't judge, but I'm assuming it's a slight damage increase. It only matters for base damage as headshots are usually kills anyway. [/b]
In pvp, a head shot is already a kill, and it should stay as 2 shot for body. This sniper is a high-risk, high-reward. Either you get a headshot with it or YOU DIE. The damage increase per kill will not make it a 1 shot-body shot OP sniper.
What I think needs a buff:
-it is about 3 seconds between shots, lower it to 2 seconds, or make each kill increase RoF slightly to make it 2 seconds.
-the iron sights could use a bit of work, like bad juju
Sniper overhaul:
-1 bullet per clip, make it 1 shot regular, non major enemies crit or no in PvE only, PvP is still 2 shot. give it a good reload speed. in pve for regular majors, 2 shots if the second is a headshot (due to increased precision damage).
-make iron sights smaller. [b][/b]
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buff this, nerf this, goddamn, the gun is fine. this thing is for pve, definitely not pvp. not saying it won't be good in pvp, but that with its perk, it seems to be primarily for pve.