The XL-70 Individual Weapon is an experimental British assault rifle developed by the Royal Small Arms Factory in Enfield. It is chambered in .223 Remington, an intermediate cartridge also used in the battle-tested M16 American service rifle, and which would later be standardised as the 5.56x45mm NATO. This rifle has a bullpup layout, a gas-operated rotating bolt action, and is normally issued with 30-round AR-15 type magazines, which would later become the almost universally compatible STANAG magazines. XL-70 prototypes are extremely hard to come by, and only sometimes issued to elite troops such as the Special Air Service.