I have a very well preserved BA LHSP assembly that hase the sight with the very same paint stuff you mentioned. If you need pics lmk.Ordnance something called "sight graduation filler" having never seen any I don't know if it was some sort of paint stick or something you rubbed on and then off.
I'll leave it to those who did all the real work to ID themselves if they care to.
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The attention to detail is amazing. I have a pretty good idea who all was involved here. Not too many of us BA fanatics out there that would go to such great lengths. Come forth all of you!!! :rofl: