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The assault rifle is one of the basic firearms used by the Prototypes. Since Alex Mercer was a scientist before his death, he required training in order to operate this weapon efficiently. By consuming military personnel, Alex was able to use the rifle more effectively.
The assault rifle is a fully-automatic carbine variant with the Rail Interface System and a Vertical Foregrip attached to the hand guard. Assault rifles are highly effective against infected civilians and Walkers, while causing minor damage to the Hunters and Brawlers.
- Despite the Marines clearly wearing body armor, they can be killed with a single shot.
- The weapon is rendered to look detailed from a distance, but if zoomed in on, the weapon is clearly of low detail and is very boxy, most likely to even out the gameplay as you won't be using this weapon all the time. Also note: the M4/M16 rifle had a fixed,triangular stock at the first mission. However, immediately just after the first mission, all the rifles had a telescopic stock instead. This is especially weird since in the real life, it is impossible to make such a fast change.
- In Prototype 2, Blackwatch and Marines now use customized HK416 assault rifles instead of M16 rifles that were used in Prototype.
- In some cutscenes, soldiers are seen with M16A2 rifles, though they are never used in gameplay.