bruce what the hell does that mean? through hardened??? forgive my ignorance???
Brian and Jim did a great job of answering your question, Recon. I'll only add that SR101 does not possess INFI's or SR77's lateral strength. That's why, generally speaking, Jerry differentially-hardens his large SR101 blades.
Would I buy an M9 if it weren't differentially-hardened? No. With all due respect for Jim's and Vic's comments, for me it would be a deal-breaker. In a SHTF situation, I'd trust my differentially-hardened Camp Tramp before I'd trust a through-hardened M9.
Was the M-6 through hardened of diff tempered?I'd say if that was then the M-9 would certainly be.
Yes! I just doubled check the Rat forum. M6 was differential, as well as the Chopwieler. The only larger than 6" knives that broke my little rule of thumb were the Mojos. When I asked about it, it was stated that it was because they had a different "intention" for those knives that the rest of the line. As in, they were more a tactical tool, than a wilderness tool.