I suspect that the shoulder of the barrel was relieved to relax the torque, and make the barrel easier to remove. Mk. III Rosses and P'14/M1917 Enfields have a reputation being challenging to de-barrel.
I suspect that the shoulder of the barrel was relieved to relax the torque, and make the barrel easier to remove. Mk. III Rosses and P'14/M1917 Enfields have a reputation being challenging to de-barrel.