Well, almost anything.
The only time I use hip fire with the TAC AR is super close engagements.
Anything else, and I use the scope.
And believe me, its closer than you think, 7 meters in fact.

From 10 meters all the way to its maximum range, it just outdoes everything.

The ONLY WAY to fix it without breaking it, is having a limit on the fire rate.
Take a note from Halo Reach and the DMR.

Its a high damage weapon, but it has a limited fire rate.
3-4 shots per second.
For comparison, the normal AR does 12.5 shots a second.
You could fire it faster, but the bloom kicks in and your weapon starts to be highly inaccurate. (Which doesn't happen in Dust, if you are aiming down sights your weapon will hit exactly where you aim)

So I suggest copying it.
3-4 shots a second keeps you accurate.
(This puts it at 312 DPS without any damage mods and skills. )
(For comparison, the normal AR does 420 DPS)
( think its fare considering the range you get, and the amount of spare ammo * damage per bullet you have.)
If you go faster, up to 5-6 shots a second, it will be extremely hard to control and unlikely to hit anything, but still doable at cloes range
(This puts it at 468, a bit above the auto AR.)

Anything more than that would be impossible to do thanks to a fire rate cap.
It will still be useable at close and close-medium range, but it won't be as effective as other weapons that are occupying this space.

If you're telling me that it breaks the weapon, let me ask you a question.
At what range is the TAC AR supposed to be used?
Another question.
Can anything else hit you at that range? (Except the sniper)
No?

Here is the thing.
I'm using the GLU constantly, I see no reason to use other AR's.
And I will still use it if the suggestion here is implemented.

Gameplay>reality 100% of the time.
No exceptions.
The fact that you said it's stupid to use any other gun is emblematic of the fact that they current stats on it are even more stupid. All the weapons in this game, and only one is considered worth using?

We're not looking for "realism". At most we're looking for verisimilitude, but even that is secondary to having a balanced weapon set that requires you to pick a weapon for a situation, NOT have one weapon that does all things and removes the need to use anything else and even punishes the people who do so.

At the end of the day, this is about fun, not realism. And getting **** on unless you use only one gun 100% of the time is just plain boring and moronic.

no becuase it still doesn't fix turbo controllers which are the main problem with the gun. The TAC needs an over heat like the SR tho I would make it over heat to long jam not to burn.