OK.... I have consulted the Part List / Diagram and I see what you mean. I\m pretty sure that part 259 (1) is still where it should be as the the rear sight is still in place.
Does part 258 (2) have a flat spot or other feature that engages the end of the part 259? If it does I may have misaligned them causing part 259 to be loose and prone to flying out under heavy recoil.
Thanks
1. The grub screw under the rear sight.
2. The pin that hold in the fire selector switch.
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