Odd 'step' in the bore?

[RCS]

I can remember years ago when these BMG M1919A4 barrels in new condition were very cheap to buy. Gunsmiths would use these heavy barrels to
build inexpensive target rifles. Having to deal with the stellite liner was always a problem when these barrels were used on Model 1903 and US Enfields
Model 1917.

Mr Clark, the boys in the machine gun groups would really like your FAL on full auto down in Arizona as your barrel would last along time !