Even with a Mana stat of 0.06, I'll become the strongest with just my skill is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

“There’s not a monster a slingshot can’t defeat” Yuu’s father left him with a slingshot after saying that. With his proficiency with the slingshot, Kimura Yuu became “An F-rank with a 100% accuracy”, and has become active in fighting low-grade monsters. However, with his mana at “0.06” and the lowest rank, the teammates he raids with often ridicules him. One day, a command window which writes “Target point reached, exclusive store has been unlocked” “Skill: Flint Finger has been given as a reward”. With his skills levelling up, he started defeating high-grade monsters one-by-one, even with his 0.06 mana… Will Yuu become the strongest Hunter with the slingshot his father left him