The Empty Gun is a weapon item sold by Bratty and Catty, who reside in the right alleyway at MTT Resort. Its defensive counterpart is the Cowboy Hat. According to Bratty and Catty, it was found (along with their other wares) in Waterfall at the garbage dump, explaining its empty barrel.
When attacking with this item, four bars appear instead of one. Hitting a bar exactly in the center causes it to flash gold while missing a bar causes it to flash red. Its attack animation is initially a big star, which explodes into a series of "gunshot" circles with eight stars spinning counterclockwise outside of the circle. Hitting at least 2 bars in the center with the other two close by causes the attack animation to appear golden, greatly increasing damage. Hitting all 4 bars in the center doubles the damage that would have been dealt had one of the bars barely missed. This gives the Empty Gun (as well as the Burnt Pan) an incredibly high damage potential for skilled players.
The Empty Gun requires much precision to use, as the bars move more quickly than other weapons, and it deals considerably less damage if the four bars are not hit near the center.