Forge gun is still useful, don't talk to me about swarms, they were over nerfed, you're sad, we know, continue applying lotion, maybe it'll assuage the butthurt.

ANYWAY.

For those who are willing to ADAPT, from a TOTALLY FRESH character you can have a good proto forge fitting for 2.5M. Many of these skills are luxuries, and aren't necessary to kill a tank (for example, I prefer using the DAU over the Ishukone). Others of these are cross-skills, like some of the weaponry skill, grenade skills, and weapon upgrades. Now. Without further ado:

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NECESSITIES.

Weaponry 5 = 311k
Heavy Weapon Op 3 = 136k
Forge Gun 4 = 311k

You are now the proud owner of an Assault Forge Gun, and can kill most tanks without a problem. Assuming you're not a scrub.

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NICE THINGS TO HAVE.

Dropsuit Command 3 = 89k
Amarr Heavy Frame 3 = 274k
Forge Gun Op 5 = (a further) 311k
Forge Gun Proficiency 1 = 32k
Explosives 1 = 13k
Grenadier 2 = 100k

You now have a nicely rounded Ishukone Assault fitting with some STD Packed nades.

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ROUNDING THAT SHIT OUT.

Forge Gun Proficiency 3 = (a further) 311k (feel free to go further if you really want; 3 is where it starts to get expensive)
Handheld Weapon Upgrades 5 = 621k (Does this even need saying? Should I even add this? Doesn't everyone own this skill?)
Grenadier 4 (5) = 622k (1.24M)

You're done. You now have a double complex damage modded proficiency three Ishukone Assault Forge Gun fitting, with either EX-11 or Lai Dai Packed AV Grenades.
EDIT: Drapedup Drippedout suggests flux grenades instead, because you don't need the grenades for primary damage and fluxes are more versatile. I agree with him to an extent, excepting the fact that I play a lot of ambush and the high DPS of AV nades at close range pays itself off when you spawn on top of the tank. (You still probably die)

Comes to about 3M (3.5M) SP all up, of which 2M is dedicated to the fitting, where the rest is cross-compatible, and most people have them already (grenades and damage mods)

If you can't kill my HAV with this, you're a bad player (assuming I'm not using my scrub permahardened fittings). I'm sorry but there's no polite way to put it.
My HAV is a fully proto-fit Gunnlogi, in case you're wondering.

Now. I've invested this much SP into forges, and, more importantly, triple this on HAVs. I know people who have 20+M invested into HAVs. This fitting will screw them all.

But you guys don't want to work to kill tanks, you just want to bitch. I guess I've wasted my time.
EDIT: PARKOUR PRACTIONER (practitioner?) likes remotes, which you can't fit on a fatsuit, so good luck using them in conjunction with a forge.

EDIT: Atiim and Darken-Sol have both pointed out that a tank does it better. They're right. Spec a particle cannon on a Gunnlogi and watch the spam abate. But sometimes that's not an option, or your tank game is too shitty for justifying a 500k outlay, so you use a forge.


IMPORTANT EDIT: IF I GOT SOMETHING WRONG, PLEASE POINT IT OUT AND I WILL FIX IT WITH CREDIT GIVEN.