This paper model is a M-96 Mattock, an assault rifle in the game Mass Effect 2 and Mass Effect 3, the paper model was created by PepMaster. There are 156 parts on 32 pages. Medium-range, semi-automatic rifle effective against armor, shields, and barriers. Upgrades the Avenger assault rifle.
The Mattock is a semi-automatic hybrid weapon with an assault rifle's low heat production and a sniper rifle's punch. Though it does not have a sniper rifle's precision scope, marksmen favor its increased power over that of an assault rifle to bring down hardened targets. Its lack of a full-auto setting is advertised as a feature rather than a shortcoming since it curbs a soldier's tendency to spray inaccurate fire under stress. [Source: wikia]
You can download the papercraft model template here: Mass Effect 3 - M-96 Mattock Assault Rifle Free Paper Model Download