The 92SB, initially called 92S-1, was specifically designed for the USAF (US Air Force) trials (which it won), the model name officially adopted was the 92SB.It included the changes of the 92S, added a firing pin block (thus the addition of the "B" to the name), and relocated the magazine release catch from the bottom of the grip to the lower bottom of the trigger guard.
Production began in May 1976, and ended in February 1983.
Approximately 7,000 units were of the first "step slide" design and the rest were of the second "straight slide" type.
The total production of both designs was 52,000 pistols.
In order to meet requirements of some law enforcement agencies, Beretta modified the Beretta 92 by adding a slide-mounted combined safety and decocking lever, replacing the frame mounted manual thumb safety.
This resulted in the 92S which was adopted by several Italian law enforcement and military units.
The later relocation of the magazine release button means these models (92 & 92S) cannot necessarily use later magazines, unless they have notches in both areas.
The A1 models utilize a heavier slide construction combined with a slightly altered frame to accommodate the slide and tactical light rail.
While most internal components are compatible with the standard and Brigadier models, the slide and frame of the 92A1 and 96A1 are not compatible with the non A1 models.
The Beretta 92 pistol evolved from earlier Beretta designs, most notably the M1923 and M1951.
From the M1923 comes the open slide design, while the alloy frame and locking block barrel, originally from Walther P38, were first used in the M1951.
The grip angle and the front sight integrated with the slide were also common to earlier Beretta pistols.