[Zwetschgen]

This may be a law question but I am not sure.

Missouri law states that no EDC knife may be a fixed blade. Also, our law limits us to four inches. My question for you is this:
Could you list a few 4" folding knives that could be stored opened in a leather sheath.
My father and I have exstensive experience with leather and crafting items from it, mostly holsters, but I have always wanted to design a knife steath for a folding knife, simply to keep the knife opened and ready for whatever need. I was thinking a simple deep sheath without a securing strap would be best, so the hilt/tang of the knife would need to be minimal.

The idea is to store a folding knife as a fixed blade while still being under the laws definition.

[Dionysusigma]

Seems like assisted-opening would be a faster deployment over popping a button open on a sheath and drawing.

Following your original request, an Opinel #10 is a fantastic folder that can lock open, and has a carbon steel blade 3 7/8" in length. They usually run about $15 (including tax/shipping/whatever) and can be sharpened to a razor-like edge.

http://www.opinels.co.uk/wp-content/uploads/opinel101.jpg
http://en.wikipedia.org/wiki/Opinel_knife

[Zwetschgen]

Looks good. I don't want to use a button and strap method of carry, rather a deep sheath. The leather will bond and form a near perfect shape of the knife and should hold it quite well, the problem is the tang can't be too large of the knife won't deploy or be sheathed. The idea is simply to have more sheath than knife to hold the knife in place. This Opinel #10 looks perfect, but keep them coming!

[HiWayMan]

Buck 110, or 112
Sodbuster (various makes)

Probably two of the easiest to do what you want with. The Bucks lock, the sodbusters don't.

[hso]

Could you list a few 4" folding knives that could be stored opened in a leather sheath.

That list would be huge since most knife manufacturers make the majority of their folders with 4" and shorter blades. Just look for folders you like and make the sheath accordingly.

If you're just looking for an inexpensive knife to make the first sheath for a Buck 110 would be a good choice because of availability and price.