Slouse's Clown

Only one person owns this gun. Nikilis gave Slouse's Clown, the gun, exclusively to the player Slouse, and the wiki states that Slouse is the only player to hold it. There is no code, box or event behind it, so nobody else can get it.

A clown with a different label

Its model and texture are exactly the same as the common Clown Gun. Put the two side by side and the only visible difference is the name tag: Slouse's version has an orange unique background, where the regular Clown Gun has a gray common one. That makes it the only unique item in the game that reuses a mesh from the common-to-legendary range, since every other unique has its own design.

The pair

It has a partner knife with the same name, Slouse's Clown (Knife), which follows the same pattern with the common Clown Knife. The two together are the entire Slouse's Clown pair, and the gun's wiki page files it under the Trophy Items category alongside the other unique items. For a player browsing the weapon list, this page is a record of a rarity label rather than something to chase: it cannot be unboxed, crafted or traded, and its single owner is named on the wiki.