9mm is a widely used hand gun and submachine gun cartridge, known for its manageable recoil and versatility in self defense, law enforcement, and sport shooting. While not a manufacturer, many firearms companies produce 9mm specific parts, including barrels, slides, magazines, frames, triggers, and complete pistols or conversion kits. These components are popular among shooters and builders seeking reliable, customizable options for hand guns and pistol caliber carbines. If you need information on a specific manufacturer of 9mm parts, let me know!