BK2 is the exact same thickness (1/4") as a BK3, plus it is shorter overall. It also can be used for prying. The BK2 knife tip can be a plus vs the blunt/er BK3. Both are EXCELLENT products & can be used hard with no issues. If, by some chance you do manage to break one, send it to Paul Tsujimoto at Ka-Bar, i am sure he will take care of it.