The SA80 assault rifle has had a turbulent history with the British armed forces. It was the last weapon to come from the arms production base at Enfield Stock, and was seen as the world's most advanced firearm at the time. At first, this is exactly how it seems, and the army website boasts that it was so accurate that marksmanship tests needed to change. However, under the surface, things were less impressive. The operating mechanism jammed, and it was declared an incredible failure - a fact which was sadly proclaimed throughout the British media. After this poor start, the guns were modified to become far more reliable; Heckler & Koch were asked to help with the new adaptations, and exposed many flaws in the design. The Ministry of Defence have supplied these weapons to British Army soldiers serving in most UK-related conflicts since their 1985 arrival. The .223 Remington / 5.56x45mm cartridge is adopted of course as it's a NATO country weapon.