List of AR platform cartridges


The AR platform has become widely popular for makers of military and sporting rifles. Although the designations "AR-10" and "AR-15" are respectively trademarks of ArmaLite and Colt, variants of both are made by many manufacturers. The rifle comes in 2 calibers, the military caliber of 5.56 X 45 or the equivalent.223. Because of the pressures associated with the 5.56mm, it is inadvisable to fire 5.56mm in an AR-15 marked.223 and can result in damage to the rifle or injury to the shooter. The AR-15 can be converted to other calibers; it is then referred to as an AR-15 Style Rifle.

AR-15 calibers

Rimfire calibers

Some companies have created AR pattern rifles that depart from the standard AR-15 and AR-10 dimensions in order to accommodate other types of ammunition that would not fit into the those standards.
Examples include :
CartridgeOverall length
7.5×55mm Swiss
6.5×55mm
.25-06 Remington
7mm Remington Magnum
.270 Winchester
.458 Winchester Magnum
.300 Winchester Magnum
.30-06 Springfield
.338 Lapua Magnum

Other AR pattern firearms

A variety of manufacturers have introduced semiautomatic shotguns whose overall designs are heavily influenced by the AR pattern rifle.