How about 75 base ammo, 20 percent slower firing speed, but it allows the heavy to have a charge attack.

Pros:
+45% accuracy
On kill: firing speed increased for 4 seconds

Cons:
On miss after first hit: Mark-For-Death for 2 seconds

In case of reskin:
Family Business

its spread is reduced while crouching.

Since you are giving up the ability to heal and heal others immediately.

80 Base ammo
20 Before needing to reload (pistol reload speed)

Pros:
1. +10% movement speed on wearer (can stack with other speed boosts).

2. Charges its rage meter with damage dealt — takes 240 damage to fully charge rage meter.
While the buff is active, for 10 seconds the user and nearby teammates:
Have their movement speed boosted.
Are healed for 18% of the damage they deal.
have their ammo refilled 10/1 second
have their metal refilled 80/5 seconds
Activate with Mouse 3.

3. No spin up time.

4. Passive Reload

Cons:
1. + muzzle flashes from weapon
2. After switching to or from the weapon, marked for death for 6 seconds.
3. After every reload, marked for death for 3 seconds

60 round drum 120 reserve
-45% slower reload time (Based on smg reload)
+30% Explosion dmg vulnerability
+20% accurate
- as you fire Weapon slowly becomes less accurate but increases firerate.
- No random critical hits
-Honorbound, Once drawn equipping Primary marks you for death for 5 seconds unless you kill with melee or secondary.

- Ura! meter, once charged secondary fire grants 30% movement speed 30% damage
resistance and 30% of dmg done is converted to health for 8 seconds. Cannot switch to primary during this time. Damage resist does not stack.

+No spin up
+30% accuracy
-40% firerate
-15% speed while firing

let's you combo with your shotgun or melee.

Weapon always deployed, never needs to spin up.
Ammo capped to 50 rounds before needing to reload.

+15 faster firing speed
Mini Crits on headshot
Secondary fire when charged grants +15% damage resistance for 10 seconds
Dealing damage fills charge meter

Prolonged fire worsens accuracy
No random critical hits

+No spin up
+30% accuracy
-40% firerate
+30% less damage dropoff
-No random critical hits
+10% mpvespeed on wearer
clip size of 50
reloads entire clip at once

+no reloading (like the widowmaker)
-uses 4 ammo from your primary weapon per shot, doesnt have its own ammo pool

imagine

Stats:

+ 70% spin up time

+ 25% increase in walk speed

- 30% slower fire rate

- Must be reloaded (50 rounds per clip)

- 25% magazine size

- 35% damage

- 15 heath

Personally, I would make it a primary weapon similar to the Dragon's Fury. It would be semi automatic, have a much smaller magazine than other miniguns, and reward high aim with good damage and better range than other primaries. Combine this idea with the gloves of running urgently, and you might have a good ambush subclass.

I had the same idea as Nick and Flare Phoenix, to make it a primary. It would increase your base moovement speed (you are not carrying around a bloody minigun and the ammo for it). Also, faster weapon switch speed.

+no spinup
+pistol/smg accuracy
-25% fire rate
-weapon has a 50 ammo clip and 150 stored ammo
-3 second reload time

Shoots bullets, probably like the revolver's. Slow reload speed.

Basically an automatic weapon (thats it no big deal) (Also if taunt is not custom then use the natasha one)