support and mounting hardware—rotary autocannons spin the whole multiple barrel and breech assembly, which, in equal caliber versions, can weigh hundreds of kilograms more in comparison (though the weight per rounds fired is lower for the rotary). The firing rate of a rotary autocannon is directly related to the rotational speed of the barrel cluster. The need to accelerate this cluster generally requiring a large, external power supply means that the maximum attainable rate of fire is not immediately available. In addition, rotaries suffer from lower accuracy, a consequence of dispersion caused by multiple barrels rotating at a varying speed. As a result of their design, revolver cannons lack these issues altogether. Examples ADEN cannon DEFA cannon GIAT 30 M39 cannon Mauser BK-27 Mauser MK 213 Oerlikon KCA Rheinmetall Oerlikon Millennium Gun Rheinmetall RMK30 Rikhter R-23 See also MANTIS ShVAK cannon ShKAS machine gun Skyshield References External links List of Military Gatling & Revolver cannon Autocannon Firearm actions