An ArmaLite rifle (AR) is one of a series of rifles the ArmaLite company made or, more generally, a rifle based on one of its designs, such as the ArmaLite AR-15 rifle. Eugene Stoner, Jacques Michault, Melvin Johnson, Robert Fremont, and Jim Sullivan are some of the designers credited with their development. ^[1] In the United States, these rifles are generally known by their model numbers. The AR before the model number stands for "ArmaLite Rifle". ^{[2] [3]}

Model number	Model name	Cartridges	Manufacturers	Notes	Image
AR-5	Aircrew survival weapon	.22 Hornet	ArmaLite	A bolt-action, take-down survival rifle.
AR-7	Explorer	.22 Long Rifle	ArmaLite, Charter Arms, Henry Repeating Arms	A semi-automatic, take-down survival rifle.
AR-10		7.62×51mm NATO, .308 Winchester	Fairchild ArmaLite, Artillerie Inrichtingen (AI)	A lightweight battle rifle.
ArmaLite AR-14		Unknown	ArmaLite	A lightweight hunting style rifle that never made it past the prototype phase and according to reports had issues of exploding when fired.
AR-15		.223 Remington, 5.56 NATO	ArmaLite, Colt's Manufacturing Company	A lightweight assault rifle. A smaller version of the AR-10 and adopted by the United States military as the M16 rifle. Later developed by Colt into a popular semi-automatic Colt AR-15.
AR-16		7.62×51mm NATO	ArmaLite	Prototype battle rifle.
ArmaLite AR-17		12 gauge		Semiautomatic 12ga 2shot shotgun based on the earlier AR-9.
AR-18		5.56×45mm NATO	ArmaLite, Howa Machinery Company, Sterling Armaments Company	An inexpensive, easy to make, stamped steel rifle. Also known as "The Widowmaker" in Northern Ireland.
AR-180		5.56×45mm NATO	Howa Machinery Company, Sterling Armaments Company	Semi-automatic rifle version of the AR-18.
AR-100 AR-101 AR-102 AR-103 AR-104		5.56×45mm NATO	ArmaLite, Elitool	AR-100 series [4] based on the AR-16 that used a self ejecting magazine device. [5] Used in development of Ultimax 100 LMG.
AR-30, AR-30A1, AR-31		.308 Winchester, .300 Winchester Magnum, .338 Lapua	ArmaLite	Bolt-action rifle based in part on the ArmaLite AR-50 rifle.
AR-50		.50 BMG	ArmaLite	Single-shot, .50 caliber bolt-action sniper and long-range target rifle.

References