One innovation by IMI was a new, much "hotter" cartridge, the .41 Action Express (see below) to go along with the Jericho 941. A key feature shared between 9mm and .41 AE is the same as .44 Magnum and .50 AE in that the AE cartridges have rebated rims which are the same diameter as the less powerful rounds, but the case is wider, providing more capacity and potential for more power. This allows these pairs of calibers to be used in the same firearm with only a change of barrel, recoil spring and magazine.