<Table> <Tr> <Th_colspan="2"> Colt AR - 15 </Th> </Tr> <Tr> <Td_colspan="2"> A carbine variant of the Colt AR - 15 </Td> </Tr> <Tr> <Th> Type </Th> <Td> Semi-automatic rifle </Td> </Tr> <Tr> <Th> Place of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th_colspan="2"> Service history </Th> </Tr> <Tr> <Th> In service </Th> <Td> 1963--present </Td> </Tr> <Tr> <Th_colspan="2"> Production history </Th> </Tr> <Tr> <Th> Designer </Th> <Td> Eugene Stoner, Jim Sullivan, Bob Fremont </Td> </Tr> <Tr> <Th> Manufacturer </Th> <Td> Colt </Td> </Tr> <Tr> <Th> Variants </Th> <Td> see List of Colt AR - 15 & M16 rifle variants </Td> </Tr> <Tr> <Th_colspan="2"> Specifications </Th> </Tr> <Tr> <Th> Barrel length </Th> <Td> <Ul> <Li> 20 inches (510 mm) (standard) </Li> <Li> 16 inches (410 mm) (carbine) </Li> <Li> 24 inches (610 mm) (target) </Li> </Ul> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Cartridge </Th> <Td> <Ul> <Li>. 223 Remington </Li> <Li> 5.56 × 45mm NATO </Li> </Ul> </Td> </Tr> <Tr> <Th> Action </Th> <Td> Direct impingement </Td> </Tr> <Tr> <Th> Effective firing range </Th> <Td> ~ 550 metres (600 yd) </Td> </Tr> <Tr> <Th> Feed system </Th> <Td> Issued with 5 -, 10 -, 20 - & 30 - round STANAG magazines </Td> </Tr> <Tr> <Th> Sights </Th> <Td> <Ul> <Li> Fixed adjustable front and rear iron sights </Li> <Li> Detachable carrying handle with adjustable rear iron sight assembly </Li> <Li> Picatinny rails, which allows the use of various scopes and sighting devices </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Colt AR - 15 </Th> </Tr>

What is the maximum range of an ar 15