smithra_66
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It isn't strength so much but repeated hammer or striker drops without a primer to cushion the fall. You can crack the breech face on a Glock with an extreme amount of dry fire. That's the purpose of a snap cap. User needs to monitor the condition of the cap and replace/repair when it no longer functions.
The strip of leather or neoprene in the slide hammer slot on hammered semi-autos will last near indefinitely.
Sorry but I don't buy it. I think this is an old wive's tale. If the breech face can handle 35,000 psi, it can handle the striker hitting.
With the Glock, you have to dry fire it to field strip it. Surely they didn't design a gun that the field strip procedure causes damage. Imagine how many thousands upon thousands of Glocks have been dry fired thousands upon thousands of times and how few pictures you see of damaged breech faces.