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The Rimfire Report: Don’t Dry Fire Your Rimfire! Truth or Myth?

It depends a little bit on the model, but...yeah, not a good idea as a whole.

And a cheap option to a snap-cap? Drywall anchors.
 
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Well, I have always avoid dry firing my Ruger Mark II, aside from the fact that you MUST pull the trigger to de-cock it in order to disassemble it for cleaning. I just went through the manual, and it appears that dry firing is safe with the Mark II if and only if the "firing pin stop pin" is installed in the bolt. If that pin were removed and not reinstalled, the manual states that a single pull of the trigger will effectively destroy the pistol, because the firing pin will fly forward and "irreparably dent the rear end of the chamber of the barrel".

I also avoid dry firing my S&W M&P .38 revolver, made in 1905. Unlike a modern firearm with a transfer bar, the firing pin is part of the hammer, and seems kinda small, pointy and delicate. I am unsure how far forward the hammer can move if there is no cartridge in the cylinder, and the revolver is 115 years old...

Come to think of it, I've never questioned whether it is safe to carry that type firearm with a round under the hammer. I know the old Colt single actions needed to be carried with an empty chamber under the hammer. What about this age S&W double action revolver?
 
Well, I have always avoid dry firing my Ruger Mark II, aside from the fact that you MUST pull the trigger to de-**** it in order to disassemble it for cleaning. I just went through the manual, and it appears that dry firing is safe with the Mark II if and only if the "firing pin stop pin" is installed in the bolt. If that pin were removed and not reinstalled, the manual states that a single pull of the trigger will effectively destroy the pistol, because the firing pin will fly forward and "irreparably dent the rear end of the chamber of the barrel".

I also avoid dry firing my S&W M&P .38 revolver, made in 1905. Unlike a modern firearm with a transfer bar, the firing pin is part of the hammer, and seems kinda small, pointy and delicate. I am unsure how far forward the hammer can move if there is no cartridge in the cylinder, and the revolver is 115 years old...

Come to think of it, I've never questioned whether it is safe to carry that type firearm with a round under the hammer. I know the old Colt single actions needed to be carried with an empty chamber under the hammer. What about this age S&W double action revolver?

I do know that a hammer block safety was added to the Victory model K38’s after a soldier (or was it sailor?) was killed by one discharging when dropped...not sure if previous commercial K38’s had it, though.
 
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