Originally Posted by theferg2000
I have not dry fired mine, but did not know the signs to look for. He said to look at the barrel, and there should be an indention if there is dry fire damage.
In the spirit of providing information.....
Head space on a .22 cal rimfire is on the order of .040"-.042". If the firing pin in a rimfire is a few thousandths too long, it may impact the breech face, and peen it.... resulting in metal being moved into the chamber mouth. If this impact occurs enough times, failure to feed, or extract may result. A decent gunsmith can remedy this problem very quickly, with special tooling.
Some rimfires are designed to be dry fired. The Ruger MkII for example, requires dry firing as part of the re-assembly/function check process. Owners manuals sometimes indicate if dry firing is harmful, but not all address it. If you're not sure, either don't dry fire, or call the manufacturer to make sure.
This image is of a .22 cal barrel viewed from the breech end. The damage caused by the firing pin is visible at 12 o'clock on the chamber mouth. This particular barrel still functioned properly, but different barrels may, or may not function with the same degree of damage....... In an attempt to stay on topic, My GSG firing pin does NOT impact the breech face, but that may not hold true for all GSG 1911's.