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Polygonal Rifling
Polygonal rifling ( ) 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 shallower corners, which provide a better gas seal in relatively large diameter bores. For instance, in the pre-Gen 5 Glock pistols, octagonal rifling is used in the large diameter .45 ACP bore, which has an 11.23 mm (0.442 in) diameter, since it resembles a circle more closely than the hexagonal rifling used in smaller diameter bores.Barrel History History The principle of the polygonal barrel was proposed in 1853 by Sir |
Polygonal Vs Normal Rifling
In geometry, a polygon () is a plane figure made up of line segments connected to form a closed polygonal chain. The segments of a closed polygonal chain are called its '' edges'' or ''sides''. The points where two edges meet are the polygon's '' vertices'' or ''corners''. An ''n''-gon is a polygon with ''n'' sides; for example, a triangle is a 3-gon. A simple polygon is one which does not intersect itself. More precisely, the only allowed intersections among the line segments that make up the polygon are the shared endpoints of consecutive segments in the polygonal chain. A simple polygon is the boundary of a region of the plane that is called a ''solid polygon''. The interior of a solid polygon is its ''body'', also known as a ''polygonal region'' or ''polygonal area''. In contexts where one is concerned only with simple and solid polygons, a ''polygon'' may refer only to a simple polygon or to a solid polygon. A polygonal chain may cross over itself, creating star polygon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Civil War
The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of America, Confederacy ("the South"), which was formed in 1861 by U.S. state, states that had Secession in the United States, seceded from the Union. The Origins of the American Civil War, central conflict leading to war was a dispute over whether Slavery in the United States, slavery should be permitted to expand into the western territories, leading to more slave states, or be prohibited from doing so, which many believed would place slavery on a course of ultimate extinction. Timeline of events leading to the American Civil War, Decades of controversy over slavery came to a head when Abraham Lincoln, who opposed slavery's expansion, won the 1860 presidential election. Seven Southern slave states responded to Lincoln's victory by seceding f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M1895 Lee Navy
The M1895 Lee Navy was a straight-pull magazine rifle adopted in limited numbers by the U.S. Navy and Marine Corps in 1895 as a first-line infantry rifle.Walter, John, ''The Rifle Story: An Illustrated History from 1776 to the Present Day'', MBI Publishing Company, , 9781853676901 (2006), pp. 133–135Sampson, W.T., ''The Annual Reports of the Navy Department: Report of Chief of Bureau of Ordnance'', Washington, D.C.: U.S. Government Printing Office (1895), pp. 215–218 The Navy's official designation for the Lee Straight-Pull rifle was the "Lee Rifle, Model of 1895, caliber 6-mm" but the weapon is also largely known by other names, such as the "Winchester-Lee rifle", "Lee Model 1895", "6mm Lee Navy", and "Lee Rifle, Model of 1895". It fired a 6mm (0.236-in. caliber) cartridge, which used an early smokeless powder,''Reports of Companies'', The Chemical Trade Journal and Oil, Paint, and Colour Review, Vol. 18, June 20, 1896, p. 401: The Smokeless Powder Co., Ltd. originally dev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lee–Metford
The Lee–Metford (also known as the Magazine Lee–Metford) is a British bolt action rifle which combined James Paris Lee's rear-locking bolt system and detachable magazine with an innovative seven-groove rifled barrel designed by William Ellis Metford. It replaced the Martini–Henry as the standard service rifle of the British Empire in 1888, following nine years of development and trials, but remained in service for only a short time until replaced by the Lee–Enfield. Design Lee's bolt action mechanism was a : * The rear-mounted lugs placed the operating handle much closer to the rifleman, over the trigger. This made it much quicker to operate than other, forward-mounted lug designs which forced the rifleman to move his hand forward to operate the bolt. It also enabled the rifleman to operate the trigger with his middle finger while still holding the bolt between thumb and index finger. * The bolt's distance of travel was identical with the length of the cartridge, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Service Rifle
A service rifle (or standard-issue rifle) is a rifle a military issues to its regular infantry. In modern militaries, this is generally a versatile, rugged, and reliable assault rifle or battle rifle, suitable for use in nearly all environments and is effective in most combat situations. Almost all modern militaries are issued service pistols as sidearms to accompany their service rifles. The term can also be used to describe weapons issued by non-military forces, such as law enforcement or paramilitaries. If the issued weapon is not a rifle or carbine, but instead a different type of firearm intended to serve in a specialized role such as a combat shotgun, submachine gun, or light machine gun, it is called a service firearm or service weapon. History Firearms with rifled barrels existed long before the 19th century, but were not widely used until the mid-19th century in conflicts such as the Crimean War and American Civil War. Thus, rifles in the early 19th century were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battle Of Spotsylvania Court House
The Battle of Spotsylvania Court House, sometimes more simply referred to as the Battle of Spotsylvania (or the 19th-century spelling Spottsylvania), was the second major battle in Lt. Gen. Ulysses S. Grant and Maj. Gen. George G. Meade's 1864 Overland Campaign of the American Civil War. Following the bloody but inconclusive Battle of the Wilderness, Grant's army disengaged from Confederate General Robert E. Lee's army and moved to the southeast, attempting to lure Lee into battle under more favorable conditions. Elements of Lee's army beat the Union army to the critical crossroads of the Spotsylvania Court House in Spotsylvania County, Virginia, and began entrenching. Fighting occurred on and off from May 8 through May 21, 1864, as Grant tried various schemes to break the Confederate line. In the end, the battle was tactically inconclusive, but both sides declared victory. The Confederacy declared victory because they were able to hold their defenses. The United States decl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Sedgwick
John Sedgwick (September 13, 1813 – May 9, 1864) was an American military officer who served as a Union Army general during the American Civil War. He was wounded three times at the Battle of Antietam while leading his division in an unsuccessful assault against Confederate forces, causing him to miss the Battle of Fredericksburg. Under his command, the VI Corps (Union Army), VI Corps played an important role in the Battle of Chancellorsville, Chancellorsville Campaign by engaging Confederate troops at the Second Battle of Fredericksburg and the Battle of Salem Church. His corps was the last to arrive at the Battle of Gettysburg and thus did not see much action. Sedgwick was killed by a sharpshooter at the Battle of Spotsylvania Court House on May 9, 1864, making him and Major Generals James B. McPherson, Joseph K. Mansfield, and John F. Reynolds the highest-ranking Union officers to be killed in the war. He is remembered for an List of last words#Ironic last words, ironic rema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sniper Rifle
A sniper rifle is a high-precision, long range shooting, long-range rifle. Requirements include high accuracy, reliability, mobility, concealment, and optics, for anti-personnel weapon, anti-personnel, anti-materiel rifle, anti-materiel and surveillance uses by military snipers. The modern sniper rifle is a portable shoulder-fired rifle with either a bolt action or semi-automatic firearm, semi-automatic action (firearms), action, fitted with a telescopic sight for extreme accuracy and chambered for a high-ballistic performance Centerfire ammunition, centerfire cartridge (firearms), cartridge. History The Whitworth rifle was arguably the first long-range sniper rifle in the world. Designed in 1854 by Sir Joseph Whitworth, a prominent British engineer, it used barrels with hexagonal polygonal rifling, which meant that the projectile did not have to "bite" into the rifling grooves as with conventional rifling. His rifle was far more accurate than the Pattern 1853 Enfield, which ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sharps Rifle
Sharps rifles are a series of large-bore, single-shot, falling-block, breech-loading rifles, beginning with a design by Christian Sharps in 1848 and ceasing production in 1881. They were renowned for long-range accuracy. By 1874, the rifle was available in a variety of calibers, and it was one of the few designs to be successfully adapted to metallic cartridge use. The Sharps rifles became icons of the American Old West with their appearances in many Western-genre films and books. Perhaps as a result, several rifle companies offer reproductions of the Sharps rifle. History Sharps' initial rifle was patented September 12, 1848, and manufactured by A. S. Nippes at Mill Creek in Philadelphia, Pennsylvania, in 1850. The second model used the Maynard tape primer, and surviving examples are marked ''Edward Maynard - Patentee 1845''. In 1851, the second model was brought to the Robbins & Lawrence Company (R&L) of Windsor, Vermont, where the Model 1851 was developed for mass pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breechloading
A breechloader is a firearm in which the user loads the ammunition from the breech end of the barrel (i.e., from the rearward, open end of the gun's barrel), as opposed to a muzzleloader, in which the user loads the ammunition from the ( muzzle) end of the barrel. The vast majority of modern firearms are generally breech-loaders, while firearms made before the mid-19th century were mostly smoothbore muzzle-loaders. Only a few muzzleloading weapons, such as mortars, rifle grenades, some rocket launchers, such as the Panzerfaust 3 and RPG-7, and the GP series grenade launchers, have remained in common usage in modern military conflicts. However, referring to a weapon explicitly as breech-loading is mostly limited to weapons where the operator loads ammunition by hand (and not by operating a mechanism such as a bolt-action), such as artillery pieces or break-action small arms. Breech-loading provides the advantage of reduced reloading time because it is far quicker to load the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muzzle-loading
A muzzleloader is any firearm in which the user loads the projectile and the propellant charge into the muzzle end of the gun (i.e., from the forward, open end of the gun's barrel). This is distinct from the modern designs of breech-loading firearms, in which user loads the ammunition into the breech end of the barrel. The term "muzzleloader" applies to both rifled and smoothbore type muzzleloaders, and may also refer to the marksman who specializes in the shooting of such firearms. The firing methods, paraphernalia and mechanism further divide both categories as do caliber (from cannons to small-caliber palm guns). Modern muzzleloading firearms range from reproductions of sidelock, flintlock and percussion long guns, to in-line rifles that use modern inventions such as a closed breech, sealed primer and fast rifling to allow for considerable accuracy at long ranges. Modern mortars use a shell with the propelling charge and primer attached at the base. Unlike older muzzleloa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
