Recovering from surgery & bored, so I got out my DCM (Jan 86) M1icon Rifle. After some disassembly, started to research some of the parts. It's a SA s/n 1.63 mil, so the lock bar rear sight isn't so unusual, but when checking it I found that it's the short pinion/ 6-40 thread with a "round" bar.

I can see why they didn't last very long. There's no way to secure the bar and if it's loosened more than about 5 clicks, it falls off...and in my warm, well lit shop it was a pain to replace. In a freezing foxhole in Bastogne that would be an issue.

Aren't these worth some $$$ ?
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