Chain Guns have a very high RPM, but they don't deal much damage to compensate for it. After firing for a set period of time, they will stop firing for one second (this is called overheating). They always decrease the player's speed.
“The XL Grinder is the first of a 3-part series of gatling guns. Like other gatling guns, it is...XtraLarge Grinder
“The Mauler is the first chain gun unlocked in Gun Bros 2. It is relatively weak, with a power of...The Mauler