The Self Loading Rifle (SLR) was the first rifle used by the British Army that fed rounds from a removable box magazine. These box magazines are made of pressed steel and hold twenty rounds:These magazines have a distinctive lug brazed on the front:These replace the simpler dimple of the FAL magazine upon which the design is based, this then means that FAL magazines can be fitted to an SLR, but SLR magazines cannot be fitted to a FAL, as in the Falklands War where British troops could use Argentine magazines but not the reverse. This magazine has been numbered at some point, with a painted patch and the number ‘277’ written on with a black marker on the base:And back of the magazine:The magazine has the combined ‘E’ and ‘D’ logo of Enfield and the number ‘74’ stamped on the side:The number presumably indicated the year of manufacture, 1974. The SLR uses NATO standard 7.62mm ammunition:Very similar magazines can be found, but with a capacity of 30 rounds rather than 20. These magazines are for the L4 light Machine Gun but will fit in the SLR, however as the L4 feeds from above and uses gravity to help, the springs are not as powerful as in the SLR magazine and feeding problems can occur. Soldiers were officially only issued five of the SLR magazines, giving them a total of a hundred rounds. As these could be used up very rapidly, it is easy to see why swapping them for thirty round magazines giving the soldier 50% more rounds would be popular. Having said that much larger load outs were common, especially in the Falklands where one Para claimed to have carried 21 magazines for an assault and having expended all the ammunition scavenged Argentinian FAL magazines to carry on with, one wonders how apocryphal this story is however.