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An anti-tank rifle is an anti-materiel rifle designed to penetrate the vehicle armor of armored fighting vehicles, most commonly , armored personnel carriers, and infantry fighting vehicles. The term is usually used for weapons that can be carried and used by one person, but is sometimes used for larger weapons. A "anti-tank rifle" requiring seven men to set it up. The usefulness of rifles for this purpose ran from the introduction of tanks in World War I until the Korean War. While medium and heavy tank armor became too thick to be penetrated by rigid projectiles from rifles that could be carried by a single soldier, anti-tank rifles continued to be used against other "soft" targets, though and rocket-propelled grenades such as the bazooka were also introduced for infantry close-layer defense against tanks.
The first attempt at boosting penetrating power was the so-called 'reversed bullet'. This used the same cartridge and bullet as the regular round, but the bullet was "reversed" and an increased propelling charge was used. The next development was a special armour-piercing bullet, the K bullet (in German Patrone SmK Kurz 7.92 mm), which could also be fired from the regular infantry rifle. It had an increased propelling charge and a steel core bullet. This had about a 30% chance of penetrating the 8 mm armour of contemporary tanks if it struck the armour at a perpendicular angle.
Both types had their specific advantages and disadvantages: for example, the K bullet was more expensive to produce and therefore was generally only issued to snipers and other advanced marksmen who could use it more effectively; the ordinary infantryman had to make do with reversed bullets, which were far less effective and had to be used in closer proximity to the target. In addition, both types of round damaged the rifles due to the higher propellant load and the resulting higher muzzle velocities and pressures: firstly, service life of the rifle barrel was decreased significantly because of the increased wear. Secondly, the higher pressure created in the chamber could jam the bolt, leading to the extractor claw failing to extract the cartridge and only breaking off the cartridge rim, leaving it stuck in the chamber. The strain of firing the increased charge could also burst the chamber of weaker and older rifles, at best destroying the rifle and at worst injuring or killing the rifleman. For these reasons, the K bullet and reversed bullet were not popular with the troops. Nevertheless, it gave the infantry a chance to stop a tank in an emergency, or at least injure or kill some of the crew if a bullet penetrated.
Even as the rounds were introduced, tanks were being designed and built with thicker armour rendering these rounds largely ineffective, though they remained in use against the older designs and armoured cars. Hence, a purpose-built weapon was required to counter the newer tanks.
The first purposely-designed infantry anti-tank rifle was designed by Germany. The Mauser 1918 T-Gewehr large-calibre (13.2 mm) rifle was capable of penetrating the armour of the newer generations of tanks and allowed a chance at stopping them. The high recoil of the rifle was very hard on the firer, sometimes breaking the collar bone or dislocating the shoulder. Although the rifle was unique to its role, it was a development of the Mauser rifles and high-powered British sporting rifles that had preceded it. The 13.2 x 92 mm (0.52 in) cartridge was not unusual either, as some 0.50-inch firearms had already been fielded in land warfare with the relatively new and more powerful (as compared to black powder) smokeless powders of the era.
At the same time, in the US, a half-inch high velocity round was being developed for use against aircraft. It would be used with the Browning-designed .50 calibre machine gun. This round was upscaled from current US .30-06 calibre infantry ammunition. When word of the German anti-tank shell spread, there was some debate as to whether it should be copied and used as a base for the new machine gun cartridge. However, after some analysis the German ammunition was ruled out, as its performance was inferior to the modified Springfield .30-06 round and was semi-rimmed, making it difficult to feed into an automatic weapon. The Browning M2 .50 cal machine gun would go on to function as an anti-armour machine gun.
In later years of the war, as armour became thicker on newer tanks, the effectiveness of a man-portable rifle lessened. This was particularly true in British Malaya, where the light Japanese tanks specially configured for jungle conflict rode roughshod over British forces supplied with the Boys anti-tank rifle. At first small cannons up to 20mm calibre were used, but the anti-tank role soon required more powerful weapons which were based on the application of chemical energy in the form of the shaped charge anti-tank rifle grenade. To these were added rocket launchers such as the bazooka, such as the Panzerfaust, and rocket-propelled grenades — some anti-armour successes were achieved with heavy-calibre autocannon by the Luftwaffe, especially with the Bordkanone BK 3,7 autocannon, mounted in twin against Soviet armour on the Eastern Front. Some anti-tank rifles, like the Finnish L-39, were still used by snipers to harass the enemy, like firing phosphorus bullets at tanks' open hatches, or to smoke an enemy sniper out of his position.
Although no longer capable of penetrating even the side armour of modern main battle tanks, they are capable of causing serious damage to their external fittings such as periscopes, optics, sensors, tank treads, and machine guns. For example, the Croatian RT-20 was developed to destroy thermal sights on Serbian tanks. They are also useful in disabling or even destroying lesser armoured rear units and support vehicles, helicopters, low-flying and personnel.
World War I
World War II
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