Counter-Strike Global Offensive is a free online shooter released in 2012. The game is focused on team competition. As expensive as it is powerful, the SCAR-20 is a semi-automatic sniper rifle that delivers a considerable damage at the expense of a long reload time. It was covered with a green marine pattern and decorated with custom-made yellow details. Exchange your Soul Gems for the StatTrak™ SCAR-20 | Green Marine. The SCAR-20 is a semi-automatic sniper rifle, manufactured by FN Herstal in Belgium. It is widely used by military and law enforcement forces around the world. In the game Counter Strike: Global Offensive it is a powerful weapon that can change hands quickly, making it a popular choice of experienced players.