In 1990, following several slide separation incidents in the U.S. armed forces’ training and experimentation, Beretta incorporated a ‘slide retention device.’ This quick fix consists of an enlarged hammer axis pin, which, if the slide’s rear end separates during recoil, engages in a groove machined inside the slide’s lower left rear portion to keep the slide on the frame. With the slide retention device fitted, Beretta designated the pistol Model 92FS, advancing the gun to its current configuration.”
