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I believe S&W stopped using the internal lock system on these, older ones have it for sure.

Jaime, The Model 340 PD NO INTERNAL LOCK >>>> https://www.smith-wesson.com/product/model-340pd?sku=103061 .....Happy New Year!

Jaime, this is no internal lock Sir. S&W stopped the ILS in May of 2019. Cheers and safe Holidays!

No, this model does not have an internal lock. Hope this helps.