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Mark, the Pro Series does not have the Internal Lock Sir : https://centerfiresystems.com/product/smith-wesson-178041-442-performance-center-pro-38-special-1.88-5-round-black-stainless-steel-black-synthetic-grip

Mark, this model does not have a internal lock/Hillary hole. If you ever want to find more pictures/information you can Google the upc 022188780413 buds always lists the upc under descriptions or feel free to ask us. Hope this helps and you're very welcome.

As mentioned, this model Does Not have internal Lock.

Mark, this model does not have the internal lock. Full specs here >>> smith-wesson.com/sites/default/files/spec-sheets/178041%20-%20Model%20442%20Cylinder%20cut%20for%20moon%20clips.pdf ....Have a great day!