You are meaning the false top edge of the clip, right? Illegal to do here in Calif., seems it makes the knife a dagger and dirks/daggers are verboten.
I think that it limits your versatility of the knife somewhat, but you should be able to use it just fine for most field chores.
A "dirk" or "dagger" is defined in the California penal code as any fixed blade knife or open pocket knife that can be used as a stabing implement, and thus must be carried openly on the belt. You CAN carry a double edged knife in California, just as long as it is not concealed.
A few other misconceptions:
1. A fixed blade under ____ inches can be concealed. FALSE! All fixed blades must be exposed no matter what size.
2. Folders must be under ____ inches in order to be carried/carried concealed. FALSE. There is no length limit on folders in the CA penal code, except for government buildings or schools, cant remember exactly. But there are some places that have local laws defineing a legal length limit. For example, I think(could be wrong) L.A. has a 3 inch length limit to folders.
3. You can't carry a double edged knife in CA. FALSE. You can as long as it is exposed.
As far as I know just about everything else is prohibited from carrying concealed, or even carrying in or possesing as far as I know. You are safe with a concealed folder of any length or a fixed blade exposed, single or double edged, but nothing else that I am aware of, unless you get your CCW permit.
ETA: This link pretty much somes it up and provides the actual penal code.
http://www.equalccw.com/knifelaw.html The length limit is limited to schools, and local ordinances such as L.A.
Anyways, I hope this helps clear up some of CA's knife law misconceptions.
Sorry for Hijacking the thread. As you were.