The Air Force did also briefly consider arming the A-10 with the Oerlikon 3-0-4-R-K 30mm revolver cannon, however it had a much lower rate of fire and was significantly less reliable than the GAU-8.
It is based on the 35 mm Oerlikon Revolver Gun Mk3 automatic cannon, which has a firing rate of 1,000 rounds per minute and ...