Marksman

"This Chimeran sniper rifle was first recovered by Specter Team Corporal Marshall Webb in Kirkwall, Scotland, and modified for human use by SRPA Research and Development. It fires multiple ion burst across great distances, and has a significantly higher rate of fire than any human sniper rifle to date."

The Marksman is a human modified version of a Chimeran sniper rifle. The primary fire shoots 3 ion bursts at great speed. The alternate fire shoots out a small drone that floats around zapping enemies that it runs into. The Marksman is good for mid to long range attacks. Its primary drawback is that since it shoots 3 round bursts and it only has 18 (21 in multiplayer) rounds a clip, allowing the shooter to be frequently reloading the weapon. Another drawback is it carries only 4 magazines including the one already in the gun, having the shooter to keep a count of his/her shots. It appears that the Chimera abandoned the design after the humans acquired it, as no Chimera soldier has been seen carrying it.

Trivia

 * The Marksman is very similar to the Halo franchise's Battle Rifle, which also fires 3-round bursts and features a scope on the top.