I've heard this more than once but I don't recall exactly from where. Besides that, there are lots of little indicators such as the same sheaths, the same type of printing on the blades, those "beta plus" locks, and other similarities.
I only recently saw the claim that Sanrenmu was making knives for Spyderco and I think I saw it on Spyderco's forum. I'll start a thread over there and ask for confirmation. I know Sanrenmu is a major manufacturer and does OEM work for a bunch of other companies. The thing is that most companies outsourcing to China don't say which manufacturers are doing the work. That's why a persistent barb against some of the people denouncing Ganzo, Sanrenmu, etc. has been that those people might own knives made by those companies and not know it.
Well I know that RealSteel and Sanrenmu both made knives for same designers, so they even produce virtually same knives, just in different size.
RealSteel sheath seems to be that same generic Kydex that even Boker Plus is using (and it's also made in China).
Maybe they use same technology for printings... or they all send their knives for that to be done at the same place.
RealSteel claims they produce all of their knives themselves at one place so I'll give them benefit of the doubt.
They also use Sandvik steel a lot, and even CPM or Bohler steels lately so that means they probably started importing steel.
What did they do with their D2?
- I have no idea...
I saw Manly Patriot in D2 get really small chipping after hitting into a bone and also when I hit a staple when cutting cardboard.
I heard about LionSteel M2 in D2 getting edge damage (light reflection) after contact with bones during skinning and meat processing, yet that D2 didn't even dull after cutting into a bone several times and it's Chinese D2 made in China, while other 2 are European D2 made in Bulgaria and Italy.
I never tested directly, but edge retention seems to be about the same.
I just wish I knew what they did? Did they just HT to different hardness? Did they lower the carbon content? Did they change composition?