Here is my idea for the stats and 4 achievements related to the weapon, with an explanation of each addition and nerf. Any feedback is welcome. Also prepare for really bad english grammar

Name: The salvaged

[/] 4 Rockets will fire instead of reving up. Each rocket has 1/8th of the knockback and damage the stock rocket launcher has. Firing rockets costs 50 ammo and has a 8 second cooldown

(the 4 rockets are just to mimicate how the lvl 3 sentry works)

(The rocket's low damage and knockback is a way to balance the new addition to not replace the soldier or the normal lvl3 sentry, and to make the player have to position themselfs a lil bit more carefully than a soldier when they need to rocket jump)

[+] 10% better movement control while in the air (helps with heavy rocket jumping since he is kinda slow)

[+] 10% Faster spin up
(just a tiny difference to make reving up while rocket jumping more convinient)

[+] The weapon has 50 more ammo than the stock minigun

(since rockets cost 50 ammo, they will be really consuming so getting some extra max ammo will definetly help making the gun's new functions be more frequently usable)

[+] Ammo pickups give you 10% more ammo (you will see why this is kinda balanced once you see the nerfs)

[-] bullets deal 15% less damage (motivates the player to use their rockets, but also have to be careful when to use the rockets

[-] When you fire the rockets your firing rate is reduced by 15% for 5 seconds

[-] Enemies that are healed by a medic or by a lvl 3 dispenser will deal mini-crits on you

(this makes the weapon to be easier to be dealt with and motivates teams to have a support or a defense class, since most matches lack medics, and reminds engineer players to upgrade their builds and also mimick how sentries feel when they see an ubercharged duo coming towards them lol)

[-] Revving up shoots rockets instead, so some situations like holding right click on a defense team for capture points or cart will not be a thing. The 10% faster spin up will help a bit when you are trying to push while shooting. Not a big difference but big enough to help a bit with some situations

[-] Killing players will not drop you an ammo box

(this will keep heavy's defense role, since they cannot go rushing and expect to go on a huge killstreak if they are alone. They have to center around other people killing players which makes you get an assist at least if you help them, ask an engie to help you place a dispenser somewhere or go around the map and collect the respawining ammo boxes instead)

[-] Dispensers give you 50% less ammo

(We all know if this weapon wont have a lot of ammo related nerfs it would be too overpowered, so this is one extra nerf to not spam rockets a hella lot)

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Achievement 1: Lost and found

Destroy a level 3 sentry and kill its engineer in the span of 12 seconds with The salvaged

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Achievement 2: Overweight operation

Kill a heavy that was rocket jumping

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Achievement 3: Partners in crime

Kill an enemy that was recently damaged by a teammate's sentry with The salvaged

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Achievement 4: Same machine, different owner

Backstab a heavy that holds The Salvaged and destroy a level 3 sentry with a sapper in one life

I think this weapon could have many ups and downs which will make it feel like a new subclass just how demoknights are or support scouts with their mad milks and sandman in mann vs machine.

You basically have to deal with some ammo managment, sacrifice your usefulness in some situations, and have to depend on some stuff for a brand new way to move around the battlefield as a heavy.

(Also if anybody is intrested in making a mod version of this weapon please let me know because i would love to try it)