Hello welcome to my build. This is my first build so plz post tips, about ow to make a better build. I made a stack build for Jax. If you use this items you are very overpowerd.
Have fun while using this build.

At the beginning buy this:
Boots of Speed
Health Potion 2x
Mana Potion

Than buy as fast as u can the Ninja Tabi, they are very usefull because of the dodge chance.
After that buy Guinsoo's Rageblade and Sword of Occult. That buy Hextech Revolver, it is a very good item cause of the spell vamp, with this item Jax health himself when he use a spell. Than but the Mejai's Soulstealer and after that u can buy the Hextech Gunblad with the Hextech Revolver. At least u buy a Phantom Dancer.

I use the spells Exhaust and Ignite for Jax !!
Exhaust is good for running away and to make an enemy slower.
Ignite is usefull if an enemy is nearly dead but you can't jump tro an enemy ore use ur normal atack. Ignite is also nicee to kill tryndamere if he uses his ulti.
I don't use flash with Jax because i alredy can jump tro my enemys ore when I run I can jump tro allies.

The End !!