Dang, this gun thing is addictive. Had my first gun less than a month and I'm already thinking about my next gun. (Alright, I admit, I was thinking about it the day before I picked up my first gun...but that just makes my point! ) I'm torn between getting a .22 for cheap practice and getting a .45 for home defense. My son suggested getting a 1911 in 45ACP and getting a 22 conversion kit for it. My question is this: Will a 22 conversion kit fit ANY 1911 or are there different conversion kits for different manufacturers 1911 models? I'm not interested in competitive target shooting, so ultimate accuracy of either caliber is not overly critical. Practical accuracy for self defense is all I need.