The XL-64 Individual Weapon is an experimental British assault rifle developed by the Royal Small Arms Factory in Enfield. It is chambered in .280 British, an intermediate cartridge. The rifle has a bullpup layout, a gas-operated rotating bolt action, and a 20-round detachable box magazine. Beginning in the mid-1960s, the XL-64 has begun replacing the EM-2 assault rifle wherever it is still used, for example in the 3 Commando Brigade, which includes elements from the Republican Marine Commandos.