Welcome from Montana from a displaced Texan.
You likely can find a replacement that is suitable for the whole latch, but it's a tall order for the pin alone. The one that was eaten by my 49 Russian has proven to be hard to replace just the pin. The Chinese replacements are ten bucks or so...and since yours is already missing it's pin, replacement should be a breeze.
Glad to have you aboard (pun intended).