with more than 30,000 produced, the Messerschmitt Bf109 is the most prolifically manufactured fighter in history; of its variants, the G-6 ended up being probably the most numerous at 13,000 aircraft. Responding to enhancing Allied foes floating around, Bf109 G aircraft had the more effective DB605 engine, and from the G-6 had been built with dual 13mm MG131 device guns that required the distinctive bulges on either part of cockpit cowling referred to as "Beule." Some were even provided a 20mm cannon gondola under each wing for further enhanced firepower. The Bf109 G-6 was implemented on both the Western and Eastern fronts, particularly dominating Soviet adversaries because it proceeded in service until the end of WWII.