I am about to take on a project to shorten my old model 20. I will be sure to stay over 18 inches and will be keeping the stocks. Just making the last resort SHTF weapon from one I haven't shot in over 20 years. I will get some before and after pics as I go. 9mm, 45 and 12 guage should do nicely. Not only that but shotgun rounds are still easy to find.