I am 22 and in college and have acquired the funds to begin my firearms collection. My father is arguing with me to buy a full, completed Thompson from Kahr Arms instead of my idea of buying the parts kit (if i can ever find one at a reasonable price). My fear is that since Kahr bought out Auto-Ordnance the parts will not work. Are the original M1 or M1A1 parts interchangeable with the Kahr Thompsons? Thanks