Armor piercing ammunition is used to penetrate hardened armored targets such as body armor, vehicle armor, concrete, tanks and other defenses, depending on the caliber of the fire arms. Armor piercing ammunition consists of a hardened steel, tungsten carbide, or depleted uranium penetrator enclosed within a softer material, such as copper or aluminum. Armor piercing ammunition can range from rifle and pistol caliber rounds all the way up to tank rounds. Bullet resistant vest (in tan) A bullet-resistant vest (body armour or body armor (U.S.)) - is an article of protective clothing that works as a form of armour to minimize injury from projectiles fired from handguns, shotguns and rifles . ... Placing a concrete floor for a commercial building Installing rebar in a floor during a concrete pour In construction, concrete is a composite building material made from the combination of aggregate and cement binder. ... The word calibre (British English) or caliber (American English) designates the interior diameter of a tube or the exterior diameter of a wire or rod. ... The old steel cable of a colliery winding tower Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... Tungsten carbide, WC or W2C, is a chemical compound containing tungsten and carbon, similar to titanium carbide. ... // Depleted uranium (DU) is uranium which contains a reduced proportion of the fissile isotope U-235. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic brown Atomic mass 63. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... A rifle is a firearm that uses a spiral groove cut into the barrel to spin a projectile (usually a bullet), thus improving accuracy and range of the projectile. ... A Browning 9 millimetre semiautomatic pistol Ordnance pistol of the French Navy, 19th century A pistol or handgun is a usually small firearm that can be used with one hand. ...

Rifle and pistol rounds are usually of steel or tungsten. Aircraft and tank rounds are more often of the depleted uranium type. This has been questioned in recent years due to the fact that they leave behind radioactive material and were used in inhabited areas of civilians causing radiation sickness. The penetrator is a pointed mass that is designed to retain its shape and penetrate through materials. Depleted uranium also has the advantage of being able to spall as it penetrates. This creates a fine, hot dust. This is employed in anti-tank warfare because this dust, at thousands of degrees, is able to quickly kill a tank's crew and ignite the ammunition and gas stores. Rifle armor piercing ammunition is generally a hardened penetrator surrounded with a copper jacket, just as almost every type of modern bullet is. Upon impact on a hard target, the copper case is destroyed, but the penetrator continues its motion and penetrates the substance. The Russian/Soviet government also developed armor piercing ammunition for its pistols. It is of similar design to the rifle ammo above. Rimmed, centerfire . ... Spall are flakes of a material that are broken off a larger solid body. ... Anti-tank, or simply AT, refers to any method of combating military armored fighting vehicles, notably tanks. ...

There are several reasons for the entire bullet not being made out of hard metal. Firstly, it would damage the rifling of the gun it was fired from. Secondly, bullet casing metals are often chosen for high density, which gives the bullet greater momentum—and hence higher energy—at the same velocity. Thirdly, bullets with a hard coating would deflect on coming in contact with an angled hard target such as a helmet. When an armor piercing bullet hits an angled target the soft coating deforms, at the same time making the target surface rough and providing suitable conditions for the hard core to pentrate. Rifling refers to spiral grooves that have been formed into the barrel of a firearm. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In physics, momentum is the product of the mass and velocity of an object. ... This article is about velocity in physics. ... Pickelhaube of a Swedish Royal Guard soldier For other uses, see Helmet (band) A helmet (a 15th century loan from Middle French, a diminutive of Frankish helm, from Proto-Germanic *khelmaz, PIE *kelmo- a cover) is a form of protective clothing worn on the head and usually made of metal...

Contrary to common belief, teflon or other coatings on the bullet do not in any way help it penetrate deeper. Teflon coated bullets were meant to help reduce the wear on the barrel as a result of normal operation. Teflon coating was a trend that has largely faded, in part because of laws resulting from this misconception; there was a brief moral panic over these "Cop-killer bullets", which were said to have been designed to penetrate the body armor worn by police. Teflon is the brand name of a polymer compound discovered by Roy J. Plunkett (1910–1994) of DuPont in 1938 and introduced as a commercial product in 1946. ... Certain varieties of handgun and rifle bullets are coated with a lubricant such as Teflon. ... A moral panic is a mass movement based on the false or exaggerated perception that some cultural behavior or group of people, frequently a minority group or a subculture, is dangerously deviant and poses a menace to society. ...