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SAFETY:Internal Lock

SM163072 PRODUCT DETAILS FAMILY:M&P Series MODEL:M&P340 TYPE:Revolver ACTION:Double Action Only FINISH:Matte Black STOCK/FRAME:Alloy Frame STOCK/GRIPS:Black Synthetic WEIGHT:13.3 oz CALIBER/GAUGE:357 Magnum | 38 Special CAPACITY:5 BARREL:1 7/8" OVERALL LENGTH:6.31" SIGHTS:XS Tritium Night Sight SAFETY:Internal Lock ADDL INFO:Scandium Alloy/Stainless Steel ADDL INFO:Scandium Alloy Frame

Yes, it has internal lock.

Yes it does, but that can be remedied easily enough with a lock plug.