The on-hit Ashe (6.19)
Not Updated For Current Season
This build is based around Ashe's Q Rangers Focus which has huge potential in both 1v1's and teamfights. Just to clarify something first, yes I am currently bronze and I know this isn't as strong as a normal Ashe build. I have tested this build myself and it is ok. Not great but ok.
Starting with your runes they should be as I presented them or if you want another adc runepage it's fine too. You will need the extra armor and mr since you will be very squishy. Flat AD is always usefull in laning phase especialy since you don't buy B.F Sword on your first back. Armor pen so you can avoid doing small amount of damage to tanks and fighters but that is pretty standard.
When it comes to your masteries you want to pick up Fervor of Battle gor more Q damage. Oppresor is good since Ashe passive is a slow. Cookies is good if you go a lot with another player like your support a lot, but if you want to you can take Assassin if you want to go alone.
Again since Q is the ability we focus on, BoRK, Rageblade and Muramana will be vital for the on-hit damage. It is recommended that you go with Infinity Edge and Essence Reaver for the crit, but you can go Bloodthirster and any Last whisper item you want if you think need it. Switch Infinity Edge for Mercurial Scimitar if the enemy team have lots of single target cc and you get focused.
This is a build that can work if you put some depth into it, but in the long run go with a normal build. You will be pretty much useless until you have Muramana and BoRK as you do no damage before that. As i said before I am currently bronze and good luck with this build.