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Rotating bolt is a method of locking the breech (or rear barrel) of a firearm closed for firing. Johann Nicolaus von Dreyse developed the first rotating bolt firearm, the "Dreyse needle gun", in 1836. The Dreyse locked using the bolt handle rather than lugs on the bolt head like the Mauser M 98 or M16.
A screw conveyor uses a rotating helical screw blade to move bulk materials. Because of its self-locking property (see below) the screw is widely used in threaded fasteners to hold objects or materials together: the wood screw, sheet metal screw, stud, and bolt and nut.
Straight-pull rifles differ from conventional bolt-action mechanisms in that the manipulation required from the user in order to chamber and extract a cartridge predominantly consists of a linear motion only, as opposed to a traditional turn-bolt action where the user has to manually rotate the bolt for chambering and primary extraction.
The Greene used rotating bolt-action, and was fed from the breech. The Spencer, which used lever-actuated bolt-action, was fed from a seven-round detachable tube magazine. The Henry and Volcanic used rimfire metallic cartridges fed from a tube magazine under the barrel. These held a significant advantage over muzzle-loaders.
The original Gatling gun was a field weapon that used multiple rotating barrels turned by a hand crank, and firing loose (no links or belt) metal cartridge ammunition using a gravity feed system from a hopper. The Gatling gun's innovation lay in the use of multiple barrels to limit overheating, a rotating mechanism, and a gravity-feed reloading ...
Cases of walking pneumonia are spiking across the U.S., according to the CDC. Dr. Marc Siegel speaks with Fox News Digital about common sources, symptoms and treatments.
The extractor moves with the bolt to pull the cartridge case rearwards out of the chamber, and at some point, the ejector eccentrically exerts a frontal push (from the case's frame of reference), which torques and "flicks" the case out of a side opening on the receiver known as the ejector port.
The biggest contract in professional sports history is only the prelude to a wild winter of spending. With Juan Soto, Major League Baseball's No. 1 free agent, off the board thanks to a 15-year ...