A carbon scraper was issue to every GMTK in WWII until 1943, when it was removed from the carry kit and only issued to higher echelon depot/motor pool tool-sets. I guess they figured out that they weren't going to be popping heads in the field.
The only reason I am familiar with the Duro version is because I did a little deep dive on the tool a few years ago. Duro was one of only a few mfgr's taking a spoon- (as Dads alluded to) or bearing scraper-like design approach. By far the most popular approach during WWII was the kind banding a bunch of spring steel pins together, and that was the kind of carbon scraper that was specified in the Ordnance Supply Catalog.
Below is an unbranded example (pictured with a file card, sorry), but you can find them branded by just about everyone, including Blue-Point, Plomb, and others.