Just purchased a KS-5 and would like to know what I need to turn it into a release trigger? I was told there is a part that needs to be purchased to allow this alteration. Can anyone tell me what that part would be and where I can purchase one? and also is it something I can install myself or will a gunsmith need to do the work to get the proper set and release weight's? and could someone knowledgeable of these guns tell me what the choke numbers designate? I believe I have a three, four, and five choke tube. Thanks and any and all info will be as always greatly appreciated.