First, you either have to use starter or auto. Then, you get a wall with a building on the right. You aim your gun to the bottom right, then start shooting, but you have to keep walking forward. The paint will carry you forward. It takes a while to "master" it.
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To shoot a paintball gun in Roblox, simply point to where you want to shoot at and click the left button of your mouse or trackpad.
I don't know either
you get a 8 kill steak
Usually (if the game has grenades) you press "g".
Just click on the left mouse button to shoot.