In "Sympathy for the Devil", Spike uses a break-action, single-shot pistol loaded with a custom round made from a special gem against the Wen in the climax of the episode.
The gem is made from the same energy that broke Wen's circadian rhythm, initially causing him to stop aging. However, exposing him to the gem can return aging to Wen – the only thing that can kill him. Jet crafts a bullet out of the gem and Spike loads it into a Thompson Center Contender. Jet also notes he doesn't know what will happen once the bullet goes into him – it could explode – but in the end, the gem works and turns Wen into an old man.
The gun's function and form appears to be based on the Thompson Center Arms Contender, but is entirely fictional, including a cut in the muzzle to act as a compensator.
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