Silver soldering can be done with a propane torch. The heat capacity is marginal. A Mapp torch, usually available at the larger hardware store is better.
You need silver solder, expensive because of the high silver content and you need silver solder flux, potentially expensive beecause it can remove the bluing from your Mauser. You also need solder stop, a chemical compound that will protect the blue and keep the solder from spreading. An old time heating and air conditioning mechanic might be able to do this but I would look for a very competent gunsmith.
It is NOT a do it yourself project, even on a firing pin.
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