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  2. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

  3. Pump action - Wikipedia

    en.wikipedia.org/wiki/Pump_action

    Pump-action shotguns, also called pump shotguns, slide-action repeating shotguns or slide-action shotguns are the most commonly seen pump-action firearms. These shotguns typically use a tubular magazine underneath the gun barrel to hold the shells , though there are some variants that use a box magazine like most rifles.

  4. Remington Spartan 310 - Wikipedia

    en.wikipedia.org/wiki/Remington_Spartan_310

    The Spartan 310 has a walnut stock and fore-end, the shooter can select automatic ejectors or extractors, and a ventilated barrel rib. It uses screw-in SPR choke tubes.By default, the bottom barrel fires first, but the shooter can select the top barrel to fire first by pushing the trigger blade forward when the gun is loaded and closed. [4]

  5. Remington Model 95 - Wikipedia

    en.wikipedia.org/wiki/Remington_Model_95

    Remington Model 95 with pearl handles and barrels open for reloading. The Remington Model 95 is a double-barrel pocket pistol commonly recognized as a Derringer.The design was little changed during a production run of nearly 70 years through several financial reorganizations of the manufacturer causing repeating serial number sequences.

  6. High Standard Derringer - Wikipedia

    en.wikipedia.org/wiki/High_Standard_Derringer

    High Standard Derringer was introduced by High Standard Manufacturing Company in 1962; it was a remarkable change to the over-under derringer design with innovative solutions. [ 2 ] The original model (D-100), was produced from 1962 to 1967 in 22 LR only in blued finish.

  7. COP .357 Derringer - Wikipedia

    en.wikipedia.org/wiki/COP_.357_Derringer

    The COP .357 is an American 4-shot Derringer-type pistol chambered for .357 Magnum.The double-action weapon is about twice as wide and substantially heavier than the typical .25 automatic pistol, though its relatively compact size and powerful cartridge made it an option for a defensive weapon or a police backup gun.

  8. Recoil operation - Wikipedia

    en.wikipedia.org/wiki/Recoil_operation

    An alternative design concept for recoil-operated firearms is the inertia operated system, the first practical use of it being the Sjögren shotgun, developed by Carl Axel Theodor Sjögren in the early 1900s, a Swedish engineer who was awarded a number of patents for his inertia operated design between 1900 and 1908 and sold about 5,000 ...

  9. Remington Model 11-87 - Wikipedia

    en.wikipedia.org/wiki/Remington_Model_11-87

    The Model 11-87 is a gas operated semi-automatic shotgun.Upon firing a shell, some of the high-pressure gases from the burning propellant are diverted through two small holes under the barrel, [2] forcing the bolt toward the buttstock, which in turn ejects the spent shell.