I remember my Sergeant Major in the cadets stating that the reason the Bren sights were offset was because the Bren was found to be too accurate for a machine gun and so the sights were put to one side to make it less accurate. I remember thinking to myself the reason was probably because there was a magazine stuck where the line of the sights should be and it wouldn't be much good having the sights on the centre-line unless the soldier happened to have x-ray eyes to see through the magazine. I thought it probably not a good idea to point this out to my Sergeant Major.