MS16 (FarCry 4)

“The MS16 is an updated take on an American battle rifle that dates back to the Vietnam War. Today, rifles like this are commonly used by Special Forces soldiers and SWAT teams with nothing better to blow their budgets on. The MS16s here were brought in by mail order. Hey, not every weapon on Rook Island has a sordid history. So sue me.”
— Survival Guide