Let´s start with the downsides:
No random crits

15% chance to make targets bleed
Collects heads on kill that increase sniper charge rate
40% less damage
10% slower swing speed
Creates gibs on kill.

discount headless horsemann's headtaker take kidneys instead of heads

Pros:
When Hit Results In Bleeding For 3 Seconds (No Stacking)
Each Kill Will Result In More Damage
Cons:
If you miss you will lose some of the additional Damage
No Random Crits
10% Less Damage

I can see it just as resking of stock, but that would be boring...

Stats I could see myself if I would introduce that weapon:

First option:
Pros:
+10% speed when holding weapon and you see enemy
(doesn't include disquised or invisible spies)
Mini-Critical hits on wounded players

Cons:
-20% speed when holding weapon and you don't see enemy
-20% swap speed into and from this weapon
-33% damage
No random critical hits

Second option:
Cons:
-100% damage on constructions
-50 points of health
No random critical hits

ALT: Right click to slice throgh air, creating fast purple projectile wich on hit teleports you into choosen location.
After using ability you are stuned for as much, as long took projectile to travel to point (up to 2 seconds)
After using ability you must get headshot or 3 kills to refresh ability.
Projectile deals damage equal to this weapon to enemy players and penetrates them if that projectile hits them.
Projectile will stop on enemy constructions and will not penetrate them.



First option might be easier to program, but second option opens completly new playstyle potencial for Snipers. Imagine sneaky sniper playing on King of the hill gamemode, who teleports behind enemy lines into really hard to acces area just to get some kills. Before they find out, they lose one (maybe more if sniper is skilled) friend to headshot.
Well... thats why I propose -50 points of health as extra stat - to make those snipers easier to kill once you find them.
While that would make it too risky on maps with easy acces to most areas (you won't spawn camp really with just 75 points of health so enemy balcony on 2Fort isn't ideal), on maps with hard accesible or well protected areas teleportation would be amazing for sniper. This class after all is long range class, so getting to spot no one can go into (or take long time to get to) would be interesting.

should be tribalmans shiv reskin

On kill it should steal bladders and the first 2 bladders collected increase jarate recharge time (With other stats to balance it out that I'm too lazy to try to think of)

Pros:On kill any weapon:collect 1-2 (max 6 souls) souls on activate (need 2 souls) minicrits on 4 seconds only for melee (effect time can stack and if you do this+1 bonus second) (but needs collect them in short distance)
+30% faster deploy
Cons:-When you have soul:-5% damage penalty
-20% firing speed
No random crits