Tonight I picked up a new-to-me M9-A1 that appears to be one of the "transitional" A1s (slide is just marked M9, not M9-A1). Are there any differences other than engraving between this one and the newer ones? Do they newer ones still have the LCI under the rear sight? I don't know why but for some reason I thought I read that they were doing away with it (mine has an LCI just like my first generation M40 and S40). I did try to put my carbine stock on the A1 frame and I can tell you right now, it won't go (if one were to cut off the little bit of the grip with the lanyard hole so the entire bottom edge of the magwell was flush like the first generation ones, I bet it would work ... the slot inside the grip is there, so those of you with A1s that want an IGB carbine kit, take that into consideration ... I also imagine the plastic on the IGB carbine kit could be whittled on with a dremmel until it fit, which would probably be the better way to fix it ... I bet IGB modifies their carbine kits to work with the new design soon, if they haven't already). I haven't taken this new gun to the range, but I'm thinking I like the new grip better than I thought I would. From a purely aesthetic sense, I still prefer the 1st Generation Steyrs, but handling this A1 has me appreciating some of the changes.