Black Widow: Fake, Rework, or What?

Luke et al, the course checkered black plastic grips shown of Aaron's 41 S/42 are Russian replacements. When reworking these captured Lugers, they almost alway left the original barrel, which as then marked by the importer, and they also had the original number dies for renumbering replacement parts such as toggle assemblies. If this barrel is not the original and not importer marked, I would bet that it's been changed since arriving in the US.