The Dardick Tround was a unique firearm designed in the 1950s that used a triangular cartridge. It had a rotating cylinder and a barrel that surrounded the cartridge, giving it a distinctive appearance. ¹⁾

The Gyrojet was a rocket-powered firearm developed in the 1960s. It fired small rockets instead of traditional bullets, and the rockets would accelerate as they traveled, resulting in a unique ballistic profile. ²⁾

The Punt Gun was an exceptionally large shotgun used in the 19th century to hunt waterfowl. It was so large that it was typically mounted on a punt boat or a fixed structure, and it could fire a large number of pellets at once. ³⁾

The Liberator Pistol was a single-shot pistol produced by the United States during World War II. It was designed to be a cheap and disposable weapon that could be air-dropped to resistance fighters in occupied territories. ⁴⁾

The Duck's Foot Pistol, also known as a volley gun, was a multi-barreled pistol with four to six barrels arranged in a fan shape. It was primarily used in the 18th and 19th centuries and could fire multiple shots simultaneously. ⁵⁾

The Nock Gun was a seven-barreled flintlock firearm developed in the late 18th century. It was used by the British Navy and Army and could fire all seven barrels simultaneously. ⁶⁾

The M1911 Cutts Compensator was a muzzle device designed for the M1911 pistol. It featured a series of holes around the muzzle to redirect gases and reduce recoil, improving control during rapid fire. ⁷⁾

The Chiappa Rhino is a modern revolver known for its unique barrel design. The barrel is located at the bottom of the frame, aligning the bore with the shooter's hand to reduce muzzle flip and recoil. ⁸⁾

The Pancor Jackhammer was a prototype automatic shotgun developed in the 1980s. It featured a revolving drum magazine and a unique gas-operated mechanism but never entered full-scale production. ⁹⁾

The XM25 Counter Defilade Target Engagement System, also known as the Punisher, is a semi-automatic grenade launcher developed for the United States military. It uses smart ammunition that can be programmed to explode in mid-air, allowing soldiers to target enemies behind cover. ¹⁰⁾

The APS underwater rifle is a Soviet-designed firearm specifically developed for underwater combat. It fires a specialized 5.66mm cartridge and has a unique water-sealed barrel and gas system. ¹¹⁾

The M134 Minigun is a multi-barreled machine gun chambered in 7.62mm NATO. It is notable for its extremely high rate of fire, capable of firing up to 6,000 rounds per minute. ¹²⁾

The Serbu Super-Shorty is a compact shotgun based on the Mossberg 500. It has an extremely short barrel and overall length, making it highly maneuverable in tight spaces. ¹³⁾

The Neostead is a bullpup shotgun designed in South Africa. It features a dual-tube magazine system that allows for quick ammunition selection and a high capacity. ¹⁴⁾

The Objective Individual Combat Weapon (OICW) was a prototype weapon system developed for the United States military. It combined a 20mm airburst grenade launcher with a 5.56mm assault rifle, providing enhanced firepower and target engagement capabilities. ¹⁵⁾