The Smith and Wesson 340 PD weighs about an ounce lighter than the M&P 340 because the M&P has a stainless steel cylinder but it doesn't have a warning not to shoot 110 gr or lighter loads out of it like the PD does. Also if I remember right when purchasing mine the M&P has the XS big dot night sight and the PD doesn't. Also I think you have to be careful what you clean up that titanium cylinder with or it will pit badly. I'm thinking this is correct information but someone please correct me if I'm mistaken.
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