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Paul, this model M&P340CT does have the Internal Lock - Safety.

Hi Paul, Yes this model does come with the Internal Lock / Safety. Specifications and Features: ---- .357 Magnum caliber (also accepts .38 Special) -- Double action only -- 5 rounds capacity -- XS Sights 24/7 Tritium Night front site -- U-notch rear sight -- Shrouded hammer -- Crimson Trace Lasergrip -- Stainless steel cylinder and barrel -- Overall length 6.31" -- Weight 13.3 oz -- Matte black