Enfield SA-80: L85A1 and L85A2 assault rifle, L22 carbine (Great Britain)

L22A2 carbine, as issued to Royal Armoured Corps tank crews in Iraq; note that it has a Picatinny rail above the front grip
image courtesy of Tony Williams (UK)

Caliber: 5.56x45 NATO
Action: Gas operated, rotating bolt
Overall length: 780 mm (709 mm in Carbine variant)
Barrel length: 518 mm (442 mm in Carbine variant)
Weight: 4.13 kg (with SUSAT optical sight and no magazine); 5 kg with SUSAT and loaded with magazine with 30 rounds of ammunition
Magazine capacity: 30 rounds
Rate of fire: 650 rounds per minute
Effective range: about 500 meters (with SUSAT sights)

The development of the SA80 (Small Arms for 1980s) system, which included two weapons - SA80 IW (Infantry Weapon) assault rifle and SA80 LSW (Light Support Weapon) light machine gun, began in the late 1960s when British army decided to develop a new rifle, which will eventually replace the venerable 7.62mm L1 SLR (British-made FN FAL rifle) in the 1980s.

When NATO trials were announced in 1977 to select a new cartridge, British state-owned Enfield Small Arms Factory developed its own small-caliber, high velocity round, which was more or less representing the US .223/5.56mm case necked down to accept 4.85mm (0.19 inch) bullet. When cartridge came out, Royal Small Arms Factory at Enfield developed a new weapon around it, initially designated as SA80-IW or XL65. This weapon, being somewhat similar in outline to the much earlier British Enfield EM-2 assault rifle, was internally quite different, and, basically, was more or less the US-made Armalite AR-18 rifle, put into bullpup stock and rechambered for 4.85mm cartridge. After NATO trials, which resulted in adoption of the Belgian SS-109 version of the 5.56mm cartridge, Enfield engineers rechambered XL65 for this cartridge and continued its development under the designation of XL70. Due to Falkland war new system was actually adopted only in 1984. Original SA80 weapons (both L85 and L86) were plagued with many problems, some being very serious. In general, L85 was quite unreliable and troublesome to handle and maintain, so, finally, in the year 1997, after years of constant complaints from the troops, it had been decided to upgrade most L85 rifles then in service.