What is a SAW machine gun?

Answer 1

The M249 Squad Automatic Weapon (M249 SAW) is the United States military designation for a sub-family of the FN MINIMI squad automatic weapon (from Mini-mitrailleuse French: "mini-machine gun". Both are 5.56x45mm NATO light machine guns manufactured by Fabrique Nationale (FN) and its subsidiaries.

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Stands for Squad Automatic Weapon, and its main role is suppresive fire power, thats why no one who actually uses it in combat ever complains about that fact that it does'nt shoot machine gun rounds, it still makes the bad guys spend more time faceplanting themselves into a corner, and less time shooting at you.