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Yes, this has an "Internal Lock" according to Smith and Wesson.

Ian, here's the specs, Hope his answers all your questions:) FAMILY:360 Series MODEL:360PD TYPE:Revolver ACTION:Double / Single Action FINISH:Matte Black STOCK/FRAME:Alloy Frame STOCK/GRIPS:Black Synthetic WEIGHT:12 Oz.
CALIBER/GAUGE:357 Magnum | 38 Special CAPACITY:5 BARREL:1 7/8" OVERALL LENGTH:6.31"
SIGHTS:Light Gathering HI-VIZ Red Dot SAFETY:Internal Lock ADDL INFO:Small Chief's Special Frame ADDL INFO:Airlite