These weapons look really coll and i could very well see them included in the game, here are some stats i came up with:

Heavy Shelling
+500% damage per bullet
+Fires singular explosive bullets
-75% fire rate

Burst Cannon
+fires in 5 shot bursts
+50% more accurate
-20% damage penalty

Ludmila
+50% max ammo
+ Becomes more accurate the longer you shoot
-50% slower spin-up time
-25% initial accuracy

Pew Lazer Gun
+fires a continuous beam that pierces enemies
+Does not require ammo
-weapon builds up heat as it is fired continuously, not firing will reduce heat
-once the heat bar is full (after 10 seconds of continuous firing), the weapon will overheat and prevent the player from firing for 5 seconds

Ammo Barrel
Fully restores minigun ammo on use. Can be thrown to allies to act as a medium ammo box

Creamy Treat
Heals 200 health on use and grants 20% damage resistance for 20 seconds
Can be thrown to act as a medium health kit
35% increase in recharge rate

Little sister
10 base damage
10 bullets per second
30 magazine size
90 total ammo

Heavy Revolver
60 base damage
0.8 second delay between shots
4 magazine size
16 total ammo

Blast Punch
+creates a small explosion each time it hits an enemy, dealing bonus 30 damage to both the user and the enemy

Fist of Heavy
+Mini-crits while active and below 50% max health
+25% movement speed while active and below 50% max health
-25% damage

ShieldArms
+50% damage resistance to attacks from the front while active
+attacks have strong knockback
-75% damage
-100% slower switch to speed
-100% slower switch off speed
-no overheal on wearer

The Slasher
+attacks cause the target to bleed
-20% fire rate
-20% damage