My go to is simple, it's the vandal off course for the one tap headshots and for a gun I wouldn't touch with a 5 foot pole is the bucky but that should be self explanatory.
Simple question, for example I'm terrible at using sojourns ult. I suddenly start missing all my shots and start rushing to try get value just to be sniped by a widow.
Very specific timing but at the exact moment you touch the enemy with you're bike you have to release you're bike. If the timing is correct you can deal 190 damage with this. I've managed to pull this of in ranked and it's highly affective if done correctly.