Got the new Spec Ops Combat Master Long today. Thought I could just swap the Kydex inserts between the two, but noooooo. Apparently they've changed the Kydex retention scheme from a Chicago screw to Velcro on the back of the insert. :grumpy:
So I had to fit both knives to their new sheaths.

I taped the spine and edge of both knives with three layers of painter's tape, then heated the Kydex at 325 degrees in the toaster oven to soften it. Upon removing the Kydex from the oven, I quickly put the knife into the sheath, then put it between two layers of foam anti-fatigue mats, and then added a heavy wood cutting board and stood on it. It worked pretty well, though not as good as the local Kydex benders can do. All I had to do after that was to heat the mouths of the Kydex with the hair dryer so I could flare them slightly.
They fit nicely without any rattling, but also without too much pressure either. The tips here to use the three layers of painter's tape worked perfectly! :thumbup: