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yes it has the internal lock see *****UPC: 022188142235 Description: S&W M442 CEN ENG 38SP DAO 1.87 Brand: Smith & Wesson Model: Model 442 - Centennial Airweight, Machined Eng Type: Revolver: Double Action Only Caliber: 38SP Finish: Matte Black Action: Double Action Only Stock: Engraved Wood Grips Sight: FT: Integral RR: Fixed Barrel Length: 1.875 Overall Length: 6.3125 Weight: 15 oz Capacity: 5 ********Safety: Internal Lock Receiver: Aluminum Alloy

This model does not have the "Internal Lock" Daniel. --- The Smith & Wesson 150785 442 Centennial Airweight Revolver in .38 Special features a 1.875-inch barrel, black finish, engraved aluminum alloy receiver, wood engraved grip, front serrated ramp sight, rear notched sight, internal hammer, smooth target trigger, aluminum alloy and carbon steel construction, double action only trigger, an overall length of 6.3125 inches, an unloaded weight of 15 oz, and a 5 round capacity. S&W details here : https://www.smith-wesson.com/firearms/model-442-revolver-engraved

seems like we found it listed both ways so I suggest contacting S&W to be 100% sure By Telephone: (USA) 1-800-331-0852 Mon-Fri 8:00AM-6:00PM Eastern Time