A lot like this:
Saw them on my search yesterday, and thinking about giving them a call. They do not list the 77/ series firing pin on their site, but one can always hope.
I sent an email to the guy who did my integral suppressor. He sends me a note back telling me "Any competent gunsmith can make you a firing pin". My first thought was "And you are...?"
Picture of the firearm for reference:
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