<P> An Armalite rifle is one of a series of rifles made by the ArmaLite company, or more generally a rifle based on one of their designs, such as the M16 rifle . Eugene Stoner, Jacques Michault, Melvin Johnson, Robert Fremont and Jim Sullivan are some of the designers credited with their development . In the United States, these rifles are generally known by their model numbers . The AR before the model number stands for "ArmaLite Rifle". </P> <Table> <Tr> <Th> Model number </Th> <Th> Model name </Th> <Th> Cartridges </Th> <Th> Manufacturers </Th> <Th> Notes </Th> </Tr> <Tr> <Td> AR - 5 </Td> <Td> Aircrew survival weapon </Td> <Td>. 22 Hornet </Td> <Td> ArmaLite </Td> <Td> </Td> </Tr> <Tr> <Td> AR - 7 </Td> <Td> Explorer </Td> <Td>. 22 Long Rifle </Td> <Td> ArmaLite, Charter Arms, Henry Repeating Arms </Td> <Td> </Td> </Tr> <Tr> <Td> AR - 10 </Td> <Td> </Td> <Td> 7.62 × 51mm NATO, . 308 Winchester </Td> <Td> Fairchild ArmaLite, Artillerie Inrichtingen (AI) </Td> <Td> </Td> </Tr> <Tr> <Td> AR - 15 </Td> <Td> Parasniper, Predator, Sporter </Td> <Td>. 223 Remington, 5.56 NATO </Td> <Td> ArmaLite, Colt, Bushmaster, Rock River Arms, Stag Arms, DPMS Panther Arms, Olympic Arms, and others </Td> <Td> semi-automatic, civilian - market version of the M16; also known as "The Black Rifle" or "Bushmaster" </Td> </Tr> <Tr> <Td> AR - 16 </Td> <Td> </Td> <Td> 7.62 × 51mm NATO </Td> <Td> ArmaLite </Td> <Td> </Td> </Tr> <Tr> <Td> M16 </Td> <Td> </Td> <Td> 5.56 × 45mm NATO </Td> <Td> Colt Defense, Daewoo Precision Industries, FN Herstal, H & R Firearms, General Motors Hydramatic Division, Elisco, U.S. Ordnance </Td> <Td> </Td> </Tr> <Tr> <Td> AR - 18 </Td> <Td> </Td> <Td> 5.56 × 45mm NATO </Td> <Td> ArmaLite, Howa Machinery Company, Sterling Armaments Company </Td> <Td> known as "The Widowmaker" in Northern Ireland </Td> </Tr> <Tr> <Td> AR - 180 </Td> <Td> </Td> <Td> 5.56 × 45mm NATO </Td> <Td> Howa Machinery Company, Sterling Armaments Company </Td> <Td> semi-automatic, civilian - market version of the AR - 18 </Td> </Tr> </Table>

What does ar stand for in a rifle