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2. 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 ...

3. Recoil - Wikipedia

   en.wikipedia.org/wiki/Recoil

   Recoil is explained by the law of conservation of momentum, and so it is easier to discuss it separately from energy. Momentum is simply mass multiplied by velocity. Velocity is speed in a particular direction (not just speed). In a very technical sense, speed is a scalar (mathematics): a magnitude; while velocity is a vector (physics ...

4. 20-gauge shotgun - Wikipedia

   en.wikipedia.org/wiki/20-gauge_shotgun

   The 20- gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [2] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States. [3][4] The 20-gauge is popular among upland game hunters ...

5. Shotgun - Wikipedia

   en.wikipedia.org/wiki/Shotgun

   Shotgun. A shotgun (also known as a scattergun, peppergun, [1] or historically as a fowling piece) is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which discharges numerous small spherical projectiles called shot, or a single solid projectile called a slug.

6. Browning Auto-5 - Wikipedia

   en.wikipedia.org/wiki/Browning_Auto-5

   Feed system. Two or four round tubular magazine, plus 1 in the chamber. The Browning Automatic 5, most often Auto-5 or simply A-5, is a recoil-operated semi-automatic shotgun designed by John Browning and manufactured by Fabrique Nationale de Herstal. It was the first successful semi-automatic shotgun design, and remained in production until 1998.

7. Remington Model 11-48 - Wikipedia

   en.wikipedia.org/wiki/Remington_Model_11-48

   The Model 11-48 is a long- recoil operated semi-automatic shotgun based on the Model 11, itself based on an 1898 design by John Browning. Shells are stored in a tubular magazine under the barrel. When a chambered shell is fired, the barrel and bolt recoiling together (for a distance greater than the shell length) re-cock the hammer, eject the ...

8. Gauge (firearms) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(firearms)

   The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) of the barrel. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the ...

9. Free recoil - Wikipedia

   en.wikipedia.org/wiki/Free_recoil

   Free recoil / Frecoil is a vernacular term or jargon for recoil energy of a firearm not supported from behind. Free recoil denotes the translational kinetic energy ( E t ) imparted to the shooter of a small arm when discharged and is expressed in joules (J), or foot-pound force (ft·lb f ) for non-SI units of measure.