ArmaLite AR-15
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The ArmaLite AR-15 is a select-fire, gas-operated, air-cooled, magazine-fed rifle manufactured in the United States between 1959 and 1964. Designed by American gun manufacturer ArmaLite in 1956, it was based on its AR-10 rifle. The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition.
ArmaLite AR-10 made by Artillerie Inrichtingen (A.I.)
Colt ArmaLite AR-15 Model 01 with 20-round magazine
Colt ArmaLite AR-15 Model 02 without magazine and new 1 in 12-inch (300 mm) rifling twist rate
An early M16 rifle without forward assist
.223 Remington
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The .223 Remington is a rimless, bottlenecked, centerfire intermediate cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm. The .223 Remington is considered one of the most popular common-use cartridges and is currently used by a wide range of semi-automatic and manual-action rifles.
A variety of .223 Remington cartridges with a .308 Winchester (right) for comparison
From left: .222 Remington, .223 Remington, and 5.56×45mm NATO
(Left to right) .223 Rem, .243 Win, .308 Win