I want to replace the barrel on my colt comander that I have had since the early 70's. Will a 80 series barrel fit? I know there will be some fitting involved but I am sure that I can do this. On Colt's website they have a barrel listed as a 80's series barrel and Midway has a Colt barrel listed just as a comander barrel. I thought that the difference between a 70's series and a 80 series pistol was the fire control group. Can someone fill me in or does midway have a tech. dept.