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David, yes Sir. This model includes the ILS "Internal Lock System". https://www.smith-wesson.com/firearms/model-19-classic

David, Yes this S&W revolver has the ILS. All the new S&W revolvers do. If your not leaving it out around kids just act like it's not there.

Yes it has the S&W ILS (internal lock) see ******* UPC: 022188874969 Description: S&W M19 357 DA REV 4.25 B AS Brand: Smith & Wesson Model: Model 19 Classic Type: Revolver: Double Action Caliber: 357 Finish: Blue Steel Action: Double Action Stock: Custom Wood Sight: Front: Red Ramp Rear: Adjustable Blade Barrel Length: 4.25 Overall Length: 9.875 Weight: 37.2 oz Capacity: 6 **********Safety: Internal Lock Features: +P Rated, Custom Wood Grip; Classic Style Thumbpiece