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ALL malfunctions (parts breakage) that I've seen with Smith & Wesson revolvers were with "tuned" revolvers. Everyone seems to want the gun "tuned", which includes "polishing" parts and reworking springs. You can't do much with the mainspring without affecting primer reliability so they usually weaken or cut the trigger return spring. When the trigger doesn't snap back smartly, a lot of shooters have a "balk", which can stress the hand and screw up the timing eventually. Hammer breakage, or firing pins, can happen with a lot of dry firing. USE SNAP CAPS! The dirty reloads and cylinder binding is a "personal" problem and CAN be prevented. I do "tune" my revolvers......by doing a LOT of dry-firing !!! Builds the hands muscles, for double-action shooting, as well as polishing the guns parts. You might read "Fast and Fancy Revolver Shooting", by Ed McGivern. He shot nothing but STOCK revolvers! Double action trigger pulls were usually 12 lbs.
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