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Ruger PC-9
The Ruger PC-9 Pistol Caliber Carbine is a blowback centerfire semi-automatic pistol-caliber carbine manufactured by Sturm, Ruger & Co., designed as a companion to certain Ruger Pistol-Series semi-automatic pistols, using the same 9 mm Parabellum and .40 S&W caliber cartridges and magazines of the P-Series pistols. Both the PC9 (the 9 mm version) and the PC4 (.40 S&W version) are modelled after Ruger's highly successful Ruger 10/22 rimfire carbine. It is intended as a shoulder-braced weapon for law enforcement use, although it was available for sale to civilians as well. The intent is that an officer will carry a Ruger P-Series pistol as a sidearm, and keep a Police Carbine available (for example, in the patrol vehicle) as a more offensive weapon if needed. Since the PC-9 has a barrel, it provides more muzzle energy with the same ammunition used by pistols which often only have barrels (see internal ballistics), thus better stopping power, accuracy and ef ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbine
A carbine ( or ) is a long gun that has a barrel shortened from its original length. Most modern carbines are rifles that are compact versions of a longer rifle or are rifles chambered for less powerful cartridges. The smaller size and lighter weight of carbines make them easier to handle. They are typically issued to high-mobility troops such as special operations soldiers and paratroopers, as well as to mounted, artillery, logistics, or other non-infantry personnel whose roles do not require full-sized rifles, although there is a growing tendency for carbines to be issued to front-line soldiers to offset the increasing weight of other issued equipment. An example of this is the U.S. Army's M4 carbine, which is standard issue. Etymology The name comes from its first users — cavalry troopers called " carabiniers", from the French ''carabine'', from Old French ''carabin'' (soldier armed with a musket), whose origin is unclear. One theory connects it to an "ancient engine of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartridge (firearms)
A cartridge or a round is a type of pre-assembled firearm ammunition packaging a projectile ( bullet, shot, or slug), a propellant substance (usually either smokeless powder or black powder) and an ignition device ( primer) within a metallic, paper, or plastic case that is precisely made to fit within the barrel chamber of a breechloading gun, for the practical purpose of convenient transportation and handling during shooting. Although in popular usage the term "bullet" is often informally used to refer to a complete cartridge, it is correctly used only to refer to the projectile. Cartridges can be categorized by the type of their primers – a small charge of an impact- or electric-sensitive chemical mixture that is located: at the center of the case head (centerfire); inside the rim ( rimfire); inside the walls on the fold of the case base that is shaped like a cup (cupfire, now obsolete); in a sideways projection that is shaped like a pin (pinfire, now obsolete ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Free-floating Barrel
A free-floating barrel is a firearm design used in precision rifles, particularly match grade benchrest rifles, to accurize the weapon system. With conventional rifles, the gun barrel rests in contact with the fore-end of the gunstock, sometimes along the whole length. If the stock is manufactured from wood, environmental conditions or operational use may warp the wood, which may also cause the barrel to shift its alignment slightly over time, altering the projectile's external ballistics and thus the point of impact. Contact between the barrel and the stock also interferes with the natural frequency of the barrel, which can have a detrimental effect on accuracy especially when the barrel gets hot with repeated firing. The interference of the stock with the barrel's oscillation harmonics as the bullet passes down the bore can cause the barrel to vibrate inconsistently from shot to shot, depending on the external forces acting upon the stock at the time of the shot. Mic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruger American Pistol
The Ruger American Pistol is a polymer-framed, semi-automatic pistol introduced by Ruger in December 2015. Design The pistol uses a pre-tensioned striker firing system, and is chambered in 9mm Luger and .45 ACP. The pistol uses a Browning-type locked-breech short recoil action, with a barrel cam system that is designed to reduce felt recoil. The serialized part of the pistol is a steel chassis, which is fit to a glass-filled nylon frame. The frame incorporates a Picatinny rail The Picatinny rail ( or ), or Pic rail for short, also known as a MIL-STD-1913 rail, 1913 rail or STANAG 2324 rail (cancelled), is a military standard rail interface system that provides a mounting platform for firearm accessories. It was ... for mounting accessories. Variants In September 2016, Ruger announced compact versions of the pistol, again chambered in 9mm Luger and .45 ACP. In March 2020, Ruger introduced the American Pistol Competition, chambered in 9mm, and the American Pistol Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Threading (manufacturing)
In manufacturing, threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element. There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as 3D printing); or combinations thereof. Overview of methods (comparison, selection, etc.) There are various methods for generating screw threads. The method for any one application is chosen based on constraints—time, money, degree of precision needed (or not needed), what equipment is already available, what equipment purchases could be justified based on resulting unit price of the threaded part (which depends on how many parts are planned), etc. In general, certain thread-generating processes tend to fall along certain portions of the spectrum from toolroom-made parts to mass-produced pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Takedown Gun
A takedown gun (typically a takedown rifle or takedown shotgun) is a long gun designed to be taken apart significantly reducing its length, making it easier to store, pack, transport and conceal. A variety of barrel, stock, and receiver designs have been invented to facilitate takedown. For example, the hinged design of many break-action firearms allows takedown. Some regular firearms can be modified to allow takedown after custom gunsmithing. Rifles American gun manufacturers including Marlin, Ruger, Savage, and Winchester have made takedown rifles since the late 1800s. Some early examples include the Browning 22 Semi-Auto rifle, Remington Model 24 and Remington Model 8 made by Fabrique Nationale and Remington Arms. Many militaries in the early 20th century also experimented with takedown systems, particularly for the use by paratroopers. An example of this being the Japanese experimental TERA Rifles. Shotguns Most single barrel and double barrel shotguns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stopping Power
Stopping power is the ability of a weapon – typically a ranged weapon such as a firearm – to cause a target (human or animal) to be incapacitated or immobilized. Stopping power contrasts with lethality in that it pertains only to a weapon's ability to make the target cease action, regardless of whether or not death ultimately occurs. Which ammunition cartridges have the greatest stopping power is a much debated topic. Stopping power is related to the physical properties and terminal behavior of the projectile ( bullet, shot, or slug), the biology of the target, and the wound location, but the issue is complicated and not easily studied. Although higher- caliber ammunitions usually have greater muzzle energy and momentum and thus traditionally been widely associated with higher stopping power, the physics involved are multifactorial, with caliber, muzzle velocity, bullet mass, bullet shape and bullet material all contributing to the ballistics. Despite much dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internal Ballistics
Internal ballistics (also interior ballistics), a subfield of ballistics, is the study of the propulsion of a projectile. In guns, internal ballistics covers the time from the propellant's ignition until the projectile exits the gun barrel. The study of internal ballistics is important to designers and users of firearms of all types, from small-bore rifles and pistols, to high-tech artillery. For rocket-propelled projectiles, internal ballistics covers the period during which a rocket motor is providing thrust. Parts and equations Hatcher breaks the duration of interior ballistics into three parts: *Lock time, the time from sear release until the primer is struck *Ignition time, the time from when the primer is struck until the projectile starts to move *Barrel time, the time from when the projectile starts to move until it exits the barrel. There are many processes that are significant. The source of energy is the burning propellant. It generates hot gases that raise the chamb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muzzle Energy
Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. Without consideration of factors such as aerodynamics and gravity for the sake of comparison, muzzle energy is used as a rough indication of the destructive potential of a given firearm or cartridge. The heavier the bullet and especially the faster it moves, the higher its muzzle energy and the more damage it will do. Kinetic energy The general formula for the kinetic energy is :E_\mathrm = \frac mv^2 where :''v'' is the velocity of the bullet :''m'' is the mass of the bullet. Although both mass and velocity contribute to the muzzle energy, the muzzle energy is proportional to the mass while proportional to the ''square'' of the velocity. The velocity of the bullet is a more important determinant of muzzle energy. For a constant velocity, if the mass is doubled, the energy is doubled; however, for a constant mass, if the velocity is doubled, the muzzle energy increases ''four'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gun Barrel
A gun barrel is a crucial part of gun-type weapons such as small firearms, artillery pieces, and air guns. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure gas(es) is used to propel a projectile out of the front end ( muzzle) at a high velocity. The hollow interior of the barrel is called the bore, and the diameter of the bore is called its caliber, usually measured in inches or millimetres. The first firearms were made at a time when metallurgy was not advanced enough to cast tubes capable of withstanding the explosive forces of early cannons, so the pipe (often built from staves of metal) needed to be braced periodically along its length for structural reinforcement, producing an appearance somewhat reminiscent of storage barrels being stacked together, hence the English name.'' A History of Warfare'' - Keegan, John, Vintage 1993. History Gun barrels are usually metal. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Police Car
A police car (also called a police cruiser, police interceptor, patrol car, area car, cop car, prowl car, squad car, radio car, or radio motor patrol) is a ground vehicle used by police and law enforcement for transportation during patrols and responses to calls for service. A type of emergency vehicle, police cars are used by police officers to patrol a beat, quickly reach incident scenes, and transport and temporarily detain suspects, all while establishing a police presence and providing visible crime deterrence. Police cars are traditionally sedans, though SUVs, crossovers, station wagons, hatchbacks, pickup trucks, utes, vans, trucks, off-road vehicles, and even performance cars have seen use in both standard patrol roles and specialized applications. Most police cars are existing vehicle models sold on the civilian market that may or may not be modified variants of their original models (such as the Ford Crown Victoria Police Interceptor being a variant of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidearm (weapon)
A sidearm is a weapon, usually a handgun, but sometimes a knife, dagger, sword, bayonet, or other melee weapon, which is worn on the body in a holster (in the case of a pistol or revolver) or sheath (in the case of a knife, dagger, sword, or bayonet) to permit immediate access and use. A sidearm is typically required equipment for military officers and may be carried by law enforcement personnel. Usually, uniformed personnel of these services wear their weapons openly, while plainclothes personnel have their sidearms concealed under their clothes. A sidearm may be carried alone, or as a back-up to a primary weapon such as a rifle, shotgun, or submachine gun. Uses In many contemporary armies, the issue of a sidearm in the form of a service pistol is a clear sign of authority and is the mark of a commissioned officer or senior NCO. In the protocol of courtesy, the surrender of a commander's sidearm is the final act in the general surrender of a unit. If no ill will is meant, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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