i am very late to the part and am only a lvl 50 gunzerker.
i use 2 infinites as my main weapons and a dpuh and a rubi for backup
i use a bee, slayer of terra class mod, sheriffs badge. i know that a lot of players do not like the infinity, but i find it good as i am able to solo terramorphus in 3 mins.
my build is below and is the best build for infinities if i an right
http://bl2skills.com/gunzerker.html#055050031005005510414100000000000
thanks in advance
All in all it looks OK, but I would still like to change a couple of things.
Skip “I’m already ready”. You’ll find the reasons here. I moved those points to get 5/5 in Yippie Ki Yay and Get Some, and the rest I put in Filled to the Brim. Which doesn’t do you any good as long as you’re sticking to Infinitys, but it’s really good for when you don’t.
The same reason made me move 5/5 from Quick Draw to Locked and Loaded.
Infinitys kills stuff just like any other gun in BL, so keep firing. When you get bored with that, you should adjust your build a little. 5/5 in MONEY SHOT!!! 'nuff said!
Here’s a great guide to Sal’s skills!
I promise I’ll have a more elaborate answer when I have access to a real keyboard, but for now, what Ronnie said is good advice.
The slayer of Terramorphous COM is bad… Seriously. The orange glow and big numbers might make it look impressive but it actually does very little for you.
A renegade COM would help you a LOT more.
I’m not part of the “Infinity sucks” bandwagon, it has its place… But that place is not in Sal’s hands.
An normal anarchist pistol with the same parts would get you better results. You have ammo regen, the Infinity brings you nothing you don’t already have.
What allows you to kill Terra is your Bee, not the Infinity. (And eventually the Bee should go too… It’s a crutch, especially on a DPS monster like Sal)
And read the skill guide Ronnie linked, it’s quite useful and was written by a very friendly, knowledgeable and handsome fellow. 
Have a look at the top gear for Sal thread too, also written by that charming man.