My Ontairo RAT-3 came with a Kydex sheath and a Tek Lok. I'd had experience with the Tek Lok before, but not with a knife sheath. Unless RC has made some modifications to the Kydex sheath that was provided with the RAT3, you will have a small problem with the Tek Lok (hereafter TK).
- Mounting holes in the Kydex sheath are not designed to work exclusively with the TK. You can mount the sheath in a couple of positions, but you'll find that it just won;t mount in that one position that you want it to. The mounting will almost work, but be far enough off to prevent it. It's frustrating.
I'm disappointed with my TK/Kydex combo. The Kydex sheath was designed, then somebody came along and said "Hey, look at this cool Tek Lock. I wonder if it'll work on our sheath". "Hey! It works in a couple of mounting positions. Cool! Let's send it out as a package deal with our RATs!!"
Better would be to design a sheath around the TK. Easy. Problems (ALL) solved.
You can buy small and large Tek Loks for a variety of purposes - camping, hiking, gear attachment elsewhere, etc. Look for them at CountyComm and elsewhere.