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A bullet button is a device used to remove a magazine in a semi-automatic rifle, replacing the magazine release with a block which forces the user to remove the magazine by using a tool rather than the magazine release button. This allows the rifle to comply with parts of California's firearms laws. The name came about in relation to a 1999 ...
Polygonal rifling ( / pəˈlɪɡənəl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile. Polygonal riflings with a larger number of edges have ...
A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button. Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from ...
2. Cartridge case, which holds all parts together; 3. Propellant, for example, gunpowder or cordite; 4. Rim, which provides the extractor on the firearm a place to grip the casing to remove it from the chamber once fired; 5. Primer, which ignites the propellant. A cartridge, [ 1][ 2] also known as a round, is a type of pre-assembled firearm ...
Magazine (firearms) A staggered-column 9×19mm Browning Hi-Power pistol box magazine. The top image shows the magazine loaded and ready for use, while the lower image shows it unloaded and disassembled. Loading of small arms ammunition into a magazine. A magazine, often simply called a mag, is an ammunition storage and feeding device for a ...
The single-bullet theory, also known as the magic-bullet theory by conspiracy theorists, [ 1] was introduced by the Warren Commission in its investigation of the assassination of U.S. President John F. Kennedy to explain what happened to the bullet that struck Kennedy in the back and exited through his throat.
A pistol cartridge which headspaces off the case mouth, e.g. .45 ACP. In firearms, headspace is the distance measured from a closed chamber's breech face to the chamber feature that limits the insertion depth of a cartridge placed in it. Used as a verb by firearms designers, headspacing refers to the act of stopping deeper cartridge insertion.
External ballistics. This schlieren image of a bullet travelling in free-flight demonstrates the air-pressure dynamics surrounding the bullet. External ballistics or exterior ballistics is the part of ballistics that deals with the behavior of a projectile in flight. The projectile may be powered or un-powered, guided or unguided, spin or fin ...