Even if the name happens to be George S. Patton, John M. Browning, Dwight Eisenhower.....??
The fact that Patton, Browning or Eisenhower weren't NAMED in the listing (and that the prior owner's name also wasn't mentioned) might suggest that the prior owner was NOT someone of great historical significance, and that there was nothing special about his or her prior ownership.
Having a non-famous prior owner's name (or driver's license number, or something similar) scratched, etched, or engraved on a gun or gun part does NOT generally increase value.
Anyone can engrave stuff on a weapon. Provenance is generally established in other ways, including an impressive paper trail. I'd pay LESS for a magazine marked in that manner.