Hey my Name is Seriouzly and ive been playing League for about 4 years now. Currently im Plat 3 on Euw and recently i discovered my love for a lovely Lady named Sarah (Miss Fortune kappa).
This build is based off the famous Korean Lucian Build considering Ghostblade and Black Cleaver are here Core items aswell. It worked pretty good for me so i wanted to share it with you guys.
Its my first guide so be fair :3
(English isnt my native language, so sry for grammar mistakes and typos)

Momentarily i think MF is very strong in the meta. Especially since Black cleaver got buffed. The current meta evolves about tanks. MF can counter that perfectly with this build. After the Lucian nerfes shes the strongest ADC right now in my opinion

Those are my usaual ADC runes
8,5 Ad, 9 Armor, 6,7 Mr and 16% Attack Speed

I usaually run fevor instead of thunderlords because you get a decent aount of autohits off in most 1v1 and you can chase enemies down pretty easily with ur e and w so more dmg is nice

This is the fun part. I played this full armor pen build many times, but to compare it i played the IE build aswell. In my opinion the crit build obviously relies alot on AA and positioning, which can be hard vs a strong cc comp. Surely the armor pen build relies alot on help from your team aswell, because if the enemies stop ur ult moost of your power is gone. But thanks to the dustblade and the huge movement speed u still can deal alot of dmg with ur AA, even without critical strikes
Therefore my favourite buildorder is
Duskblade -> Ghostblade > Black Cleaver -> Maw -> Last Whisper (Lord Dominiks Regards in most cases) -> sell boots for Mercurial

Skill Q on lvl 1 and shoot it constantly on minions to kill them and hit the enemy with the bounce. W on lvl 2 for all ins and E on lvl 3 to chase enemies. Max R -> Q -> W -> E

Heal and Flash, like every ADC to save your ***

Pros:
Strongest TF
Huge Dmg thanks to passive
Nice laning with the Q
Good Lategame
Very fast and quite good range
not too squishy when fullbuild

Cons:
Ult can be stopped easily
Relies on a team that peels for you
No escapes

Be a bully in the lane. Shoot your Q constantly and let it bounce on the enemy. Keep river warded because if you get ganked youre ****ed in most cases. When youre lvl 6 try to all in. After the bot towers fall try to roam mid, make pressure with your ult and push. Try to TF, cause thats your main strength. Always remember to stay behind your frontline, but close enough to get ur ult off