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Hi Kevin, No This particular revolver comes with no internal lock. SPECS -- When you need a handgun that you can trust your life with, you need the S&W Model M&P 340 Revolver. Smith & Wesson's unique Scandium Alloy high strength frames allow for the lightest revolvers capable of firing .357 S&W Magnum. The Smith & Wesson J-Frame has become the most popular small frame personal defense revolver on the market. With decades of reliable performance to its credit, the J-frame can be relied on no matter what. This particular revolver comes with no internal lock. Specifications and Features: .357 Magnum caliber 1.87" barrel 5 round capacity Double action only Scandium alloy frame Stainless steel cylinder Matte black finish Internal hammer XS Sights 24/7 tritium night front sight Integral U-notch rear sight Synthetic grips 6.31" overall length 13.3oz

Yes Kevin. Model M&P340 .357 Magnum/.38 Special +P 1.875 Inch Barrel Matte Black Finish (No Internal Lock) Rubber Grips 5 Round

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This is the "No internal lock: Model. (Double action only. Small J frame. Alloy frame. Front night sights and fixed rear sights. Internal hammer. No internal lock. Five round capacity).