I'm curious about the kind of failures attributed to these light J frame models. I've carried an older no lock alloy J for well over 40 years and never had any kind of failure w/any of them.
Carrying a brand new S&W 340PD (.357 mag) for 3 years before I finally decided to take it to the range, I figured hey it's a revolver they're reliable. This revolver weighs less than 12 oz and is known as the "Devil's handshake".
Firing the first two rounds were painful, pulling the trigger on the 3rd round failed to rotate the cylinder. The recoil was powerful enough to unseat the remaining bullets from its brass casing, causing the bullet to extend out far enough to jam the cylinder from rotating. I was using factory quality .357 mag ammo.
S&W was aware of this issue and recommended using lighter .357 Mag loads or just use .38 cal ammo.
I sold/trade it to a member here informing him prior of this ammo issue.
First & last time I ever had a revolver jam on me and it had to be on a $900 gun!!!