BCeagle 12 Posted April 19, 2011 The M9 is an FS hence why they look the same. The m9a1 is an fs as well. The 92a1 is NOT an fs or a 92 for that matter, you cannot take a 92 slide and put it on a 92a1 like you could on a m9a1 because of the thicker slide.. not sure why they did this but like i said the 92a1 is more of an upgraded 90two. Are you sure, I thought you could put a FS slide on an A1 but not the other way around. This is actually important if you are putting a 22 conversion kit which claims to work with all 92 series pistols. Quote Share this post Link to post Share on other sites