Patience. Obviously the gunk of the past century has solidified to a significant degree, rendering the spring insufficient to push the plunger back out. Try a bit of heat (not much more that you could get with a candle) followed by immersion in Kroil. It may take several tries, don't give up. After the number of tries that exceed your patience, give another whack at removing the sear bar plunger retaining pin...there is no way built up grease could preclude removal of the pin.
Ron
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If it's made after 1918...it's a reproduction
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