hey Fred i am pondering the same after flying my sons, dont get me wrong cause i love my 60 but i just cant imangine a 46 with my 100,( the prob is that i can). i checked the firewall and noticed that they are the same width but just a little shorter in height and forgot to check the firewall thickness, anyone know if it is the same as the 60 or will i need to beef it up? he has left for home in vegas so i guess i will have to call him and have him measure it, but yes i think ill try it. he is going to order a magnum 91 for his.