Colt does it again with this new auto based on the very successful AR-15 model. The new M-16 comes equipped with a partially serrated blade ready for action. This auto features a unique hidden button release which is molded into the knife itself. The front rubber insert rests on a rocker panel which when pushed releases the 3 1/4" blade. The knife uses a traditional spring mechanism which the user can install in 10 seconds! This way if you travel you can also remove the spring from the knife making it perfectly legal in most every state. The spring can actually be put in, or removed from the knife without taking the knife apart!