<Li> 16 inches (410 mm) (carbine) </Li> <Li> 24 inches (610 mm) (target) </Li> <Tr> <Th> Cartridge </Th> <Td> <Ul> <Li>. 223 Remington </Li> <Li> 5.56 × 45mm NATO </Li> </Ul> </Td> </Tr> <Ul> <Li>. 223 Remington </Li> <Li> 5.56 × 45mm NATO </Li> </Ul>

When did the ar 15 become available to public