This papercraft is M-97 Viper, a sniper rifle in Mass Effect game series, this paper model is created by ewos. The Viper is a semi-automatic, rapid-fire sniper rifle manufactured by Rosenkov Materials. Rosenkov developed a patented automated-release system that assists with thermal-clip ejection, shortening the Viper's reload time. This rifle is popular with military snipers, who appreciate a long-range gun that can snap off multiple shots in the blink of an eye.
You can download this papercraft template here: Mass Effect - M-97 Viper Sniper Rifle Free Paper Model Download [DropBox]