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Handguard. A handguard (also known as the forend or forearm) on firearms is a barrel shroud specifically designed to allow the user to grip the front of the gun. It provides a safe heat-insulated surface for the user's hand to firmly hold onto without needing to worry about getting burned by the barrel, which may become very hot when firing.
In contemporary spacecraft, ablative plating is most frequently seen as an ablative heat shield for a vehicle that must enter atmosphere from orbit, such as on nuclear warheads, or space vehicles like the Mars Pathfinder probe. A large amount of developmental usage was on the early 1960s rocket powered X-15 crewed aircraft traveling at ...
Due to the large amounts of heat given off by internal combustion engines, [3] heat shields are used on most engines to protect components and bodywork from heat damage. As well as protection, effective heat shields can give a performance benefit by reducing engine bay temperatures, therefore reducing the temperature of the air entering the engine. [4]
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.
The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants. History After World War II, the United States military started looking for a single automatic rifle to replace the M1 Garand , M1/M2 Carbines , M1918 Browning Automatic Rifle , M3 "Grease Gun" and Thompson submachine gun .
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In May 2008, Smith & Wesson introduced their first AR-15 style rifle in a new caliber, the model M&P15R, a standard AR platform rifle chambered for the Russian 5.45×39mm cartridge. [11] This was due to the availability cheap surplus Communist Bloc 5.45mm ammunition and AK-series weapons. [ 11 ]
The M371A1 HEAT round is used primarily against armor. It can also be used against secondary targets such as gun emplacements and pillboxes with excellent results. It is capable of penetrating 1.15 ft (350 mm) of armor plate ( steel ), 3.5 ft (1.1 m) of packed soil , or 2.5 ft (0.8 m) of reinforced concrete .