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A sniper rifle is a high-precision, long-range rifle. Requirements include high accuracy, reliability, mobility, concealment, and optics, for anti-personnel, anti-materiel and surveillance uses by military . The modern sniper rifle is a portable shoulder-fired rifle with either a bolt action or semi-automatic action, fitted with a telescopic sight for extreme accuracy and chambered for a high-ballistic performance centerfire cartridge.
During the Crimean War, the first optical sights were designed for fitting onto the rifles. Much of this pioneering work was the brainchild of a Colonel D. Davidson, using optical sights produced by Chance Brothers of Birmingham. This allowed a marksman to more accurately observe and target objects at a greater distance than ever before. The telescopic sight, or Scope mount, was originally fixed and could not be adjusted, which therefore limited its range. By the 1870s, the perfection of breech loading magazine rifles led to sniper rifles having "effective accurate" ranges of up to a mile away from their target.Raudzens, George (1990). "War-Winning Weapons: The Measurement of Technological Determinism in Military History". The Journal of Military History, vol. 54, no. 4, p. 415.
It was not until World War I that sniper rifles began to be used more regularly in battle and certain soldiers given specialized training to use such a rifle. In Germany, these trained snipers were given rifles with telescopic sights, which illuminated at night in order to improve their accuracy.Pegler, Martin. Sniper Rifles: From the 19th to the 21st Century. Oxford: Osprey Publishing, 2010, p. 31. German fitted the scope above the barrel for optimal accuracy.Pegler, Martin (2010). Sniper Rifles: From the 19th to the 21st Century. Oxford: Osprey Publishing, p. 36
During World War I, the accuracy of the sniper rifle was greatly improved.Pegler, Martin (2004). Out Of Nowhere: A History Of The Military Sniper. Oxford: Osprey Publishing, p. 222. By the end of World War II, snipers were reported to provide "reasonable accuracy" over with anything over this range being unpredictable."Telescopic Sights For Rifles." The British Medical Journal. vol. 1, no. 2891, 1916, p. 765. It was during World War I and II that the word ‘sniper’ began to be used commonly, whereas previously those who were armed with sniper rifles were referred to as sharpshooters or marksmen.Pegler, Martin (2004). Out Of Nowhere: A History of the Military Sniper. Oxford: Osprey Publishing, p. 16. These marksmen, wielding sniper rifles such as the Karabiner 98k and Mosin–Nagant Model 1891/30 sniper rifle, had a drastic and demoralizing effect on the battlefield.Pegler, Martin. Out Of Nowhere: A History of the Military Sniper. Oxford: Osprey Publishing, 2004, p. 19. Soldiers would often remain hidden in foxholes so as not to expose themselves to the deadly accuracy of a sniper. Some soldiers even began to disregard orders from commanding officers to protect against potential harm, which thus broke down the chain of command on the battlefield.Pegler, Martin (2004). Out Of Nowhere: A History of the Military Sniper. Oxford: Osprey Publishing, pp. 19–20. The sniper rifle soon acquired the reputation of being one of the most effective and ruthless weapons of war.Raudzens, George (1990). "War-Winning Weapons: The Measurement of Technological Determinism in Military History". The Journal of Military History. vol. 54, no. 4, p. 420.
Though sniper rifles had proved to be extremely effective in combat, there was still a great reluctance in many militaries to adopt a trained sniper regiment.Pegler, Martin (2010). Sniper Rifles: From the 19th to the 21st Century. Oxford: Osprey Publishing, p. 6. To effectively use a sniper rifle, a soldier had to go through particularly rigorous training, and most trainees did not make it past the first week.Lebleu, Jon (2008). Long Rifle: One Man's Deadly Sniper Missions in Iraq and Afghanistan. Guilford: The Lyons Press, p. 11. Sniper training was also so expensive to conduct that, even until as recently as 1970, the reasoning for having trained snipers as a part of an army was deemed questionable. In Britain, sniper rifles were not seen as being an integral part of an army until after the Germans boasted of their success with sniper teams during the early months of World War I. British army advisors supposed that the telescopic sights attached to sniper rifles were too easily damaged and thus not well suited for military use. However, they soon realized that these telescopic sights could be improved and made sturdy enough to withstand a sniper rifle shot.
Sniper rifles have continued to be used consistently throughout the later part of the 20th century in Korea, Vietnam and the Middle East as an integral part of the modern style of guerrilla warfare.
Law enforcement-specific rifles are usually used in non-combat (often urban) environments, so they do not have the requirement to be as hardy or portable as military versions; they may also be smaller due to the decrease in required range.
Some of the first sniper rifles designed specifically to meet police and other law-enforcement requirements were developed for West Germany police after the Munich massacre at the 1972 Summer Olympics. Many police services and law enforcement organizations (such as the U.S. Secret Service) now use rifles designed for law enforcement purposes.
The Heckler & Koch PSG1 is one rifle specifically designed to meet these criteria and is often referred to as an ideal example of this type of sniper rifle. The FN Special Police Rifle was built for, and is marketed to, law enforcement rather than military agencies.
Most telescopic lenses employed in military or police roles also have special to aid with judgment of distance, which is an important factor in accurate shot placement due to the bullet's trajectory.
A designated marksman rifle (DMR) is less specialized than a typical military sniper rifle, often only intended to extend the range of a group of soldiers. Therefore, when a semi-automatic action is used, it is due to an overlap with the roles of standard-issue weapons. There may also be additional logistics advantages if the DMR uses the same ammunition as the more common standard-issue weapons. These rifles enable a higher volume of fire, but sacrifice some long-range accuracy. They are frequently built from existing selective fire or assault rifles, often simply by adding a telescopic sight and adjustable stock.
A police semi-automatic sniper rifle may be used in situations that require a single sniper to engage multiple targets in quick succession; military semi-automatics, such as the M110 SASS, are used in similar "target-rich" environments.
Before the introduction of the standard 7.62×51mm NATO (.308 Winchester) cartridge in the 1950s, standard military cartridges were the .30-06 Springfield (7.62×63mm) (United States), .303 British (7.7×56mmR) (United Kingdom), and 7.92×57 mm Mauser (Germany). The .30-06 Springfield continued in service with U.S. Marine Corps snipers during the Vietnam War in the 1970s, well after general adoption of the 7.62×51mm. At the present time, in both the Western world and within NATO, the 7.62×51mm is currently the primary cartridge of choice for military and police sniper rifles.
Worldwide, the trend is similar. The preferred sniper cartridge in Russia is another .30 caliber military cartridge, the 7.62×54mmR, which has slightly superior performance to the 7.62×51mm, although the rimmed design limits reliability compared to the latter cartridge. This cartridge was introduced in 1891, and both Russian sniper rifles of the modern era, the Mosin–Nagant and the SVD, are chambered for it.
Certain commercial cartridges designed with only performance in mind, without the logistical constraints of most armies, have also gained popularity in the 1990s. These include the 7mm Remington Magnum (7.2×64mm), .300 Winchester Magnum (7.62×67mm), and the .338 Lapua Magnum (8.6×70mm). These cartridges offer better ballistic performance and greater effective range than the 7.62×51mm. Though they are not as powerful as .50 caliber cartridges, rifles chambered for these cartridges are not as heavy as those chambered for .50 caliber ammunition and are significantly more powerful than rifles chambered for 7.62×51mm.Williams, Anthony G. Cartridges for Long-Range Sniping Rifles.
Snipers may also employ anti-materiel rifles in sniping roles against targets such as vehicles, equipment and structures, or for the long-range destruction of explosive devices; these rifles may also be used against personnel.
Anti-materiel rifles tend to be semi-automatic and of a larger caliber than other rifles, using cartridges such as the .50 BMG (12.7×99mm), 12.7×108mm, 14.5×114mm, and 20mm. These large cartridges are required to be able to fire projectiles containing payloads such as explosives, armor-piercing cores, incendiaries or combinations of these, such as the Raufoss Mk 211 projectile. Due to the considerable size and weight of anti-materiel rifles, two- or three-man sniper teams become necessary.
When installed, barrels are often free-floating—installed so that the barrel contacts the rest of the rifle only at the receiver. A free-floating barrel avoids contact with the fore-end of the stock by the barrel itself, sling, bipod, or the sniper's hands that can interfere with barrel harmonics. The end of the barrel is usually crowned or machined to form a rebated area around the muzzle proper to avoid asymmetry or damage, and consequent inaccuracy.
External longitudinal fluting that contributes to heat dissipation by increasing the surface area, while simultaneously decreasing the weight of the barrel, is sometimes used on sniper rifle barrels.
Sniper-rifle barrels may also utilize a threaded muzzle or combination device (muzzle brake or flash suppressor and attachment mount) to allow the fitting of a suppressor. These suppressors often have a means of adjusting the point of impact while fitted.
Military sniper rifles tend to have barrel lengths of or longer to allow the cartridge propellant to fully burn, reducing the amount of revealing muzzle flash and increasing muzzle velocity. Police sniper rifles may use shorter barrels to improve handling characteristics. The shorter barrels' muzzle velocity loss is unimportant at closer ranges; the impact velocity of the bullet is more than sufficient.
Non-static weapon mounts, such as , , and shooting sticks, are also regularly used to aid and improve stability and reduce operator fatigue.
Shooting bags are also commonly used to help stabilize the rifle or to provide an adjustable base.
A 1 MOA (0.28 mrad) average extreme spread (the center-to-center distance between the two most distant bullet holes) for a 5-shot group translates into a 69% probability that the bullet's point of impact will be in a target circle with a diameter of at . This average extreme spread for a 5-shot group and the accompanying hit probability are considered sufficient for effectively hitting a human at an 800-meter distance.
In 1982, a U.S. Army draft requirement for a Sniper Weapon System was: "The System will: (6) Have an accuracy of no more than 0.75 MOA (0.2 mrad) for a 5-shot group at 1,500 meters when fired from a supported, non-benchrest position". The M24 Sniper Weapon System adopted in 1988 has a stated maximum effective range of 800 meters and a maximum allowed average mean radius (AMR) of 1.9 inches at 300 yards from a machine rest, which corresponds to a 0.6 MOA (0.17 mrad) extreme spread for a 5-shot group when using 7.62×51mm M118 Special Ball cartridges.
A 2008 United States military market survey for a Precision Sniper Rifle (PSR) called for 1 MOA (0.3 mrad) extreme vertical spread for all shots in a 5-round group fired at targets at 300, 600, 900, 1,200 and 1,500 meters. In 2009, a United States Special Operations Command market survey called for a 1 MOA (0.28 mrad) extreme vertical spread for all shots in a 10-round group fired at targets at 300, 600, 900, 1,200, and 1,500 meters. The 2009 Precision Sniper Rifle requirements state that the PSR, when fired without a suppressor, shall provide a confidence factor of 80% that the weapon and ammunition combination is capable of holding 1 MOA (0.28 mrad) extreme vertical spread, calculated from 150 ten-round groups that were fired unsuppressed. No individual group was to exceed 1.5 MOA (0.42 mrad) extreme vertical spread. All accuracy was taken at the 1,500 meter point.
In 2008, the US military adopted the M110 Semi-Automatic Sniper System, which has a maximum allowed extreme spread of 1.8 MOA (0.5 mrad) for a 5-shot group on 300 feet, using M118LR ammunition or equivalent. In 2010, the maximum bullet dispersion requirement for the M24 .300 Winchester Magnum corresponded to 1.4 MOA (0.39 mrad) extreme spread for 5 shot group on 100 meters. In 2011, the US military adapted the .300 Winchester Magnum M2010 Enhanced Sniper Rifle, which had to meet an accuracy requirement to fire ≤ 1 MOA/0.28 mrad (less than a 2-inch shot group at 200 yards) before being released for fielding.
Although accuracy standards for police rifles do not widely exist, rifles are frequently seen with accuracy levels from 0.5 to 1.5 MOA (0.2–0.5 mrad). For typical policing situations, an extreme spread accuracy level no better than 1 MOA (0.3 mrad) is usually all that is required, as police typically employ their rifles at shorter ranges. At or less, a rifle with a relatively low accuracy of only 1 MOA (0.3 mrad) should be able to repeatedly hit a 3 cm (1.2 inch) target. A 3 cm diameter target is smaller than the Brainstem, which is targeted by police snipers for its quick killing effect.
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