Have you tried the 1916 to see if it feeds ok? Fired it?
If the 1916 feeds ball ammo, it does not need any work on the barrel ramp.
Barrel ramps are only cut into the barrel, and not into the upper receiver.
The pictures below show a 9mm barrel with its ramp on top;
the next three show three stages in lining a barrel to .30 caliber.
The top picture shows the barrel liner in place, the second shows the .30 luger chamber reamed, and the third shows the finished ramp blended into the original barrel.
