A TIG weld is needed, then re-grinding of the groove, only not so deep. (Compared to the groove in the pin next to it in the pic, the groove is longer, which means it was ground deeper.) Care must be taken to maintain the internal dimensions.
Your pin is numbered with at least a number 5, which appears to be of proper style font. If the number on the pin is the same as the last two digits of the serial number, it is likely original to the gun; the inspectors simply did not catch this flaw.
d.p.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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