liarboo

Usopp is a tinkerer and capable of making devices and weapons. He is not a super genius at such things, and his skills aren't on par of Franky's, it's more like he's clever and practical with his junk and able to create interesting things. He's also capable of making tinker toys and other fun little toys, but that's not really the point here.

He is a sniper but he primarily uses a slingshot, though over time he had created more impressive slingshots. He also uses random, every day objects in clever ways to help in his fight against enemies.

( Weapons he has/Weapons he has made )

His ammo was, for the most part, made from ball bearings or pachinko balls. He would make his own ammo with pellets, filling them with various things to make them more deadly or distracting. He keeps them all in a big sack he carries with him at all times.

Attack names in bold are for Usopp mode and usually are Japanese (or Japanese with some English). Attack names in italics are for Sogeking mode and are usually English.

( The ammo )

Dials, as mentioned earlier, are shells Usopp brought back from Skypeia that have special properties. It's One Piece's weird ways of introducing technology to a world where there really isn't any, kinda like snails that are used as phones.

( Here are some dials he has )

When he was stuck training on Greenstone, his mentor Heracles teaches him about Pop Greens, which become his primary ammo of choice.

( About Pop Greens and specific kinds we've seen thus far )