The Smith & Wesson 940 is a hammerless, J-Frame revolver that was built on the new Centennial platform between 1991 and 1998. During its relatively short life, four versions were made: the 940, 940-1 with an improved extractor, and the 940-2 on the magnum J-Frame were produced in 9mm Luger. The 940 PC was a limited run of three hundred Custom Shop models chambered for the .356 TSW. The .356 TSW was a 9x21.5mm cartridge that offered ballistics similar to the contemporary .357 SIG. When moon clips are used, 9mm Luger cartridges, which are 9x19mm, can be used in the .356 TSW since the shorter cartridges headspace on the clips.
