Hey Chris:
Go easy on the knife thing.
I have about 125 Italian stilettoes left with 4-inch blades and a fingernail groove in the blade for manual operation. The knives come with a spring, pivot pin, and locking pin which can be placed through a premade hole in the handle. It is a drop in modification and everyone is told to check their laws, payment is by cash in person, or postal money orders by mail. So far I have sold most of the knives to government employees on the Federal level. The local police are younger than my generation so they are not as fond ot these knives as they are of the tanto blades. I have 4 in my personal collection, and none of them has the spring inserted as I am a fan of the Italian Stiletto design but spring knives are illegal in Wisconsin.
They are sold and function as standard folding knives and the fingernail groove in the blade cements that contention. The release button has to be pressed before you can open the blade, and they have a safety for the button. There are still states in the US that allow possesion of switchblades so the spring kit leaves you an option which no one forces you to take.
I sell them around Milwaukee, WI and the only flak I have ever heard from any of the law enforcement officers I deal with is "Don't ever have an assembled one laying around". I also sell them to the general public and make a point of determining their age to be 21 or older(18 years is sufficient for forming a legal contract, but some of the laws hereabouts use 21 for possession of certain items).
If you just want a deadly knife for crime, you can buy 46 chef's knives for $.99 at the local Good Will as opposed to what I charge for a beautifully crafted Italian Stiletto.
Bountyhunter