Ralf,
I just received a Kydex sheath for either inside the waist or on your belt from Murray at PROEDGE...it is of excellent workmanship. He now can supply a custom made Kydex for every Reeve fixed blade knife. Eric Noeldechen (On-Scene Tactical) makes them.
I am very familar with Kydex sheaths and up to this custom sheath, I did not think that Scott Hendryx could be beat..well, this sheath is just as good and the design is better! THE QUALITY AND WORKMANSHIP is as good as you can find anywhere!!
I also purchased my Mountaineer 1 from Murray Haday at PROEDGE and you won't beat his prices and customer service.
I feel that Chris Reeve makes probably the best factory (or semi-custom) knife out there and his sheath is of good quality, however, I feel that the knife is not held securely enough for me with the supplied sheath.
With this Kydex sheath the fit and lock-up of the knife is super...it won't come out on it's own!!