The lock button on the sheath is bitchy, but overall I'm very pleased with my italian Riffe.
The sliding safety on the riffe silencer can be removed rather easily after dismantling the sheath. I think it took me about 5 min with a small screwdriver to take it apart and put it back together minus the safety. Works much better now. The silencer is my back up knife which I wear on my the inside of my calf.
I use an omer mini or miniblade on my forearm for the main job, i.e. killing fish. They do the job well, but I don't like the steel quality of the omers; much to soft (and easily blunted) in my experience. I'm planning to replace it with the wenoka squeeze lock titanium some day..