Benchmade Gaucho® CPM-M4 Steel, Limited Edition
Benchmade made the NRA knives for years and this Osborne designed Gaucho was one of the finest in that line. This limited edition run features CPM-M4 steel for the blade. This steel is produced by Crucible, a company that produces most of the advanced steels we have seen in the knife industry. This steel is a tool steel that is about 6 times tougher than D2 at the same hardness.
Here is a link to the Crucible Steel page describing this steel
Only 300 of these were made so grab one if you want a truly extraordinary folder with an Axis lock and a super steel blade.