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This is a Smith and Wesson SD40 which is chambered in 40 S&W

Hi Tommy, the caliber is 40S&W Stay safe & have a great day!

Hi Tommy and welcome. This is a Gen2 (SD40 2.0) chambered in 40 S&W: This updated version of the SD40, features a new flat-face Self Defense Trigger, more aggressive slide serrations, and a more consistent trigger pull. The Gen2 is also compatible with existing SD40 holsters, lights, and lasers. Cheers, stay safe and enjoy!

40 Caliber