A gunner...believed to be Sgt J Bell...Looks through the opening in the perspex of the rear turret of R5740/ ‘KM-O’.. The four .303 Browning machine guns could discharge at a combined rate of 7,000 rounds a minute but were outranged by the heavy calibre cannon of most Luftwaffe night fighters.
Avro Lancaster aircraft under construction at the A V Roe & Co Ltd factory at Woodford in Cheshire, 1943. Despite constant losses in air battle over Germany, new production meant that the numbers of aircraft available were always increasing. - See more at: http://ww2today.com/3rd-july-1943-a-new-bomber-pilot-encounters-the-skies-over-germany#sthash.Kd87B9pK.dpuf