4 x .303 with 2500 rpg sounds abit....much...
But our Avro build bomber has indeed got 2 x .50 machine guns in it's rear turret.
A long time we had still got 2 x .303's in the rear, but after some complaining and proofing there should be at least 4 x .303's or 2 x .50's HiTech changed it to 2 x .50's.
Oh, and the machine gun indication in the hangar is never right, for many aircraft.