This rifle started being used by British troops in 2011/12 in Afghanistan, mainly because 5.56mm rounds are of very little use at ranges much over 300 yards.
It is issued as a 'marksman's rifle' (ie, below a full sniper weapon) at section or platoon level. It is accurate out to 800 yards, but can also be used at much closer battlefield ranges. UK purchased over 500 in total and they are still available having been made 'core' kit.
In game terms every section should have one from 2012 in place of the less effective 5.56mm LSW, with Para and Marine Commando units getting an extra rifle per company. The rifle can use an under barrel grenade launcher and is fitted with optical sights.
The, never very popular, 5.56mm Light Support Weapon version of the SA80 is not much used any more by regular infantry forces -although reserve units do still use it- having been mostly replaced by this rifle.
http://www.militaryfactory.com/small...allarms_id=597
http://www.army.mod.uk/equipment/23221.aspx
http://modernfirearms.net/sniper/sni...shooter-e.html