Rick,
Thank you for your comments - I think they are right on.
FedOrd was a class act. They did several gun for me and I still have a few.
They bought a bunch of Mauser Model 712 machine-pistol parts kits (everything except the frames) from the PRC. FedOrd made up new (semi-auto only) frames and built detachable magazine C96 pistols and carbines using those parts kits. Here is a page from the FedOrd Catalog. The page shows new frames, and a number of M712 barrel extensions with new barrels welded into cored barrel stubs:
This is a scan of the barrel of a FedOrd Model 714 I bought. Old scanner, very bright light, exposed things not visible to the naked eye (like the remaining buffing marks under the blue). This is an old barrel extension with a new barrel welded into the stub:
And here is a Model 1930 they restored for me, including "freshening up" the Mauser banner in the frame panel:
They were a full service shop. They would remark guns to the original markings, replace serviceable parts with new parts, numbered to the gun, and even create C96 variations that never actually existed. They restored C96 pistols to 7.63, or the new barrel could be 9 mm P. All their barrels were marked as to cartridge, unless the customer told them not to do so.