Board Thread:Off Topic/@comment-27966940-20190818020911/@comment-25396609-20191110014010

@Kirito: An SMG is a lighter weapon (generally) using a pistol caliber for ammo; they have higher capacity than a rifle or pistol but typically aren't very powerful.

A true machine gun is much heavier and uses a rifle caliber. To facilitate their rate of fire, they will be belt fed, use a box-in-belt magazine, or in some cases have a high capacity drum.