A 3D-printed single-shot pistol manufactured on consumer-grade fabrication equipment using freely available design files. The Ghost is produced from high-temperature polymer with a printed barrel, frame, and firing mechanism — the only non-printed component is a short steel barrel liner pressed into the polymer bore and a hardware-store nail for the firing pin. The weapon fires a single 9mm round with enough accuracy and reliability to function as a lethal tool at ranges under 5 meters.

Ghost pistols exist because fabrication technology has made weapons manufacturing a file-sharing problem. The design files circulate on encrypted networks, updated regularly by anonymous engineers who refine the geometry based on field reports and failure analysis. Version 14 — the current standard — has a reliable firing rate of approximately 90% and a barrel life of 8-12 rounds before the steel liner shifts in the polymer housing and accuracy becomes dangerously unpredictable.

The Ghost's most dangerous characteristic is its near-invisibility to standard screening. The polymer frame contains no metal except the barrel liner and firing pin — two small pieces that can be disguised as belt buckle components or hair accessories during separate passage through screening. The weapon can be assembled in 30 seconds from seemingly innocuous parts, fired, and discarded. A Ghost pistol that has been used in a crime looks identical to random polymer debris in a waste container. It is a weapon designed to exist for exactly as long as it is needed and then cease to exist.