I just read two state supreme court rulings where the court has declared balisongs to be legal, as they are manually locking they do not fit the definition of a gravity knife. Odd that butterfly knives might be legal where a buck 110 may not be. But if a manually locking knife cannot be illegal, I seen modifications to Opinels that allowed the blade to release and pivot freely when the lock is disengaged and you could twist the lock with your thumb, flick it around like you would an axis locked knife, then lock it manually, deploying almost as quick as any other pocket knife.
So, thinking about this more I wonder if it wouldnt be possible to modify an axis lock to lock forward manually. If you could get something like an axis lock to lock in the forward and rearward positions with a detent, but not be pushed forward with a spring, you could deploy it as fast as an automatically locking axis lock and it'd be perfectly legal in the entire state.