THIS IS A MEME BUILD I MADE ON STREAM! DO NOT ATTEMPT THIS AT HOME!

This is my build of the Karak. A pretty useless weapon of itself but when upgraded like this, it actually does surprisingly well in low level (25-40) battles.

It takes 6 formas, a lot of blood, sweat and tears and a great deal of dedication and you are on your way to the victory field of gloriousness.

About the mods:
[Stormbringer] and [Infected Clip] for Corrosive, which is good against basically everything except Elite Corpus.

[Hellfire] and [Wildfire]. [Wildfire] for that bigger magazine that will definitely help you eat away at a stronger, more armoured enemy. It also adds +60% heat, together with [Hellfire] which gives +90% heat, you have a total of +150% heat damage, which adds quite a big number on the gun and also synergizes with Corrosive and helps you take down the Infested and the Grineer even harder.

Serration and Crash Course are self-explanatory. Obviously, [Serration] gives you more flat damage and [Crash Course] adds damage but also a status effect which is Impact, which will stagger enemies when proc'd and give you a bit of CC (Crowd Control) during fights, which can be highly useful against stronger enemies like Nox.

[Split Chamber] and [Vigilante Armaments] for extra bullets. A gun without multishot will fire off 1 bullet and use 1 bullet from the magazine. A gun with a multishot of 2 will fire 2 bullets and still only use 1 bullet from the magazine. With this build, you'll have 2.5 in multishot meaning that you will be able to fire off a guaranteed 2 bullets, with a 50% of firing an additional bullet for the cost of 1 bullet from the magazine. With multishot, you'll be able to gain more damage and not suffer as much from the low magazine capacity the [Karak] have.

Conclusion:
The build makes the gun feel better than it is actually is. Bottom line is, [Karak] is a pretty mediocre gun. But with the right equipment, you can make it a bit better than mediocre. I would NOT recommend people trying this build out if they want to actually succeed in high level missions or are planning on making a build strictly for high level missions. BUT! If you have the forma, the plat and the time, this build makes the gun a blast to use. I personally spent 7 hours on my stream working this bad boy up from 0 to hero, and it was a lot of fun.

So, TL;DR, build it if you have the forma/plat and dedication IF you want a fun to use gun. Otherwise, go research for something better. (Dojo guns is a good bet)

(The [Karak] NEEDS [Sacrifice]!)