Pros:
when equipped:
+20% move speed
+50% Damage against buildings
+30% resistence against bullets

Cons:
-50% Damage against players
+35% reload time

+infinite clip-size
+inflict mini-crit to people already hitted by this weapon three times
+33% firing speed

- Overheat meter : increase when shooting
- When Overheat is full, this weapon is unusable for 16 sec
- 25% dmg penalty
- mark on death when Overheat is full (duration : 8 sec)

Overheat stat :

- Hard cap ----> 15 points
- each shot make the Cap increase by 1 point
- wait 1 sec without shooting for decreasing it for 1 point/sec

Judging by the picture

+Can Headshot
- 55% slower healing rate from medics
- 25% more damage taken from all sources

+crits headshots

+10 damage

-(soda poper or family bussines clip size?)

-2 ammo per shot(looks like a shotgun)

Can build up power and gives crits for 4 seconds when activated (rage or something new?)

Pros:

+15% Accuracy
+10% Effective range

Cons:

-33% Clip size
-10% Firing speed

+50% damage
+25% bullets per shot
-25% accuracy
-50% ammo

Pros: +Damage returns as ammo for primary weapon
Cons:-20% firing speed
-33% clip size

+unlimited ammo
+faster fire speed
-fires tracer rounds
-less damage

+100% more damage against all entity's

-no random crits

Positives
On hit: Damage dealt is returned as ammo
On kill: 20% increased damage for you and your surrounding teammates for 8 sec
Negatives
Fire tracer rounds
On miss: -15 max secondary ammo

For the Fires tracer rounds it should look like this when firing a smoke like texture :
https://www.youtube.com/watch?v=qJIOZXkq3LM the halos sniper rifle after fiirng

gibs babies at close impact and has lower firing speed than default

custom animation to the gun