Jax has been my main since i started. I like your build but i think the crit is useless to waste on your points. But i think counterstrike should be more of a late game build. It would be more worth it if the stun time went up as well. 2% increase just isnt enough for me. I prefer maxing leap strike and empower as soon as possible, with 1 point in CS at lvl 3. But it all depends on works for you. I like the 2x Gunblade. Nice work