I once bought a Model 70 through Shotgun News which the seller described as having the barrel shortened and the ramp relocated, which struk me as odd, since the Model 70 ramp is integral with the barrel. AS it turned out, the Model 70 was a pre-War carbine, worth a great deal more than I had paid for it.

Years later, however, I did buy a Model 70 which had had the barrel shortened and the ramp relocated the way you describe your 52 was treated.

Incidentally. I note that the target scope bases, which are intended for early Lyman target scope mounts, are mounted backwards, since the pointed screw which fastens the mount to the base using the hole in the side is located on the left side of the mount, rather than on the right side as was the case with later model Lyman, Fecker and Unertl scopes.