I figured the pins are a home made affair. There is a hole in each end of the ejector box and there was a pin in each of the them. They fell out when I removed the ejector mechanism. I could not see their purpose and you can see where they have been coming out of the box and pushing against the forearm. I think maybe somebody put the pins in there as a guide rod for the coil springs for some reason. They look like cut off nails. I will post some pics when I get back in.