If compact speed of fire is your thing, the MAC-10 is at the top of the list. It has a rate of fire more than double its submachine gun counterparts of up to 1,380 rounds per minute. Common calibers include the 9mm Luger, .45 ACP, and .380 ACP. There is a bit of limitation on accuracy, however, with an effective range of only up to 70 meters. It has an open bolt with a feed ramp that is part of the trigger guard and a barrel length of 4.49 inches. The short barrel greatly reduces the accuracy, but the inherent power delivered by the speed of delivery was enough to get the MAC-10 banned from the United States as part of the 1994 assault weapons ban. It was designed in the 1960s, is still in production today, and has seen limited service during wars and drug campaigns around the world.