Thanks guys! I knew someone on here would know!
I have a Mark II, but a crap Vietnam-made nylon sheath came with it. I wish it had a nice locking sheath like that Tac II. I wouldn't mind having a Tac II, but I don't relish shelling out the big bucks for them that they want for them now. Maybe I'll find a nice one at a yard sale some day...
It amuses me how Gerber had to re-posture their tactical knives as "survival" knives to make them politically-correct acceptable. Well, kind of amuses me. Actually, on second thought, it saddens me that our society has become so marshmallow-brained and pussified that we can't call killing tools by their correct names.