Name: SA80 A2 L85
Features: SA80 is the designation for a revolutionary family of assault weapons. On its introduction, it proved so accurate that the Army marksmanship tests had to be redesigned.
SA80 A2 comprises the Individual Weapon (IW) and the Light Support Weapon (LSW). These are the British Army's standard combat weapons. made by Heckler and koch, they fire NATO standard 5.56 x 45 mm ammunition. SA80 can be fitted with the SUSAT sight and a Common Weapon Sight (CWS) , which is a third generation Image Intensification (II) night sight.
Both weapons have been modified in light of operational experience, and there was a major mid-life update in 2002, which resulted in the SA80A2 series - the most reliable weapons of their type in the world. This reliability is combined with accuracy, versatility and ergonomic design. It is considered a first-class weapon system and world leader in small arms.
More info http://www.army.mod.uk/equipment/support-weapons/1458.aspx and yeah, this gun is not in MW1 but its sill awesome
Features: All information http://defense-update.com/products/r/rpg.htm but if you want all that in brief. Its used by Taliban and it makes things go boom