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  2. Valve timing - Wikipedia

    en.wikipedia.org/wiki/Valve_timing

    Valve timing diagram for a 4-stroke engine. With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in ...

  3. Multiple-barrel firearm - Wikipedia

    en.wikipedia.org/wiki/Multiple-barrel_firearm

    Remington Model 95 with pearl grips and barrels open for reloading COP .357 Magnum derringer. The original Philadelphia Deringer was a small single-barrel, muzzleloading caplock pistol designed by Henry Deringer (1786–1868) and produced from 1852 to 1868, and was a popular concealed carry single-shot handgun of the era widely copycatted by competitors. [6]

  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. Internal ballistics - Wikipedia

    en.wikipedia.org/wiki/Internal_ballistics

    Before the barrel can release the bullet in a consistent manner, it must grip the bullet in a consistent manner. The part of the barrel between where the bullet exits the cartridge, and engages the rifling, is called the "throat", and the length of the throat is the freebore. In some firearms, the freebore is zero as the act of chambering the ...

  6. SRM Arms Model 1216 - Wikipedia

    en.wikipedia.org/wiki/SRM_Arms_Model_1216

    The Model 1208 is also a short-barreled variant of the Model 1216. Its barrel length is 10", its overall length is 24 1/2", and its magazine can hold 8 rounds (4 x 2 shells). The Model 1208 also has a barrel shorter than 18 and is therefore also regulated by the NFA as a short-barreled shotgun.

  7. Chiappa Triple Crown - Wikipedia

    en.wikipedia.org/wiki/Chiappa_Triple_Crown

    The Triple Crown shotguns are triple-barrel, break-action shotguns, chambered in 12-, 20-, 28-gauge, and .410 bore. [1] [2] The 12-, 20-gauge, and .410 bore models will accept 3-inch magnum shells and the 28-gauge model will accept 2-3/4-inch shells. The 12-gauge model has 28-inch barrels, while all of the other models have 26-inch barrels. [3]

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    mail.aol.com

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  9. Shotgun - Wikipedia

    en.wikipedia.org/wiki/Shotgun

    The minimum barrel length for shotguns in most of the U.S. is 18 inches (460 mm), and this barrel length (sometimes 18.5–20 in (470–510 mm) to increase magazine capacity and/or ensure the gun is legal regardless of measuring differences [3]) is the primary choice for riot shotguns. The shorter barrel makes the weapon easier to maneuver ...