This was a formidable sting to find in any tail, but when coupled with a high speed bomber bristling with machine-guns it was often too much for German fighters. This power driven turret, housed four Browning machine-guns, each capable of firing 1,300 rounds of rifle ammunition per minute. Inside the turret can be seen the long belts of ammunition ready to pass through the guns. In modern high-speed planes power driven turrets were essential. Besides maintaining the streamlining of the fuselage they enabled accurate fire to be concentrated even whilst carrying out violent aerobatics.