ID this AK "sight"??

[mr11b]

Came across these pictures and I have no idea what type of "sight" this is. It looks like they are doing some marksmanship training. It doesn't look like a red dot. Possibly just used as a training aid? Any ideas?

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[doobee8]

It looks like it may be a sight picture training device lets the instructor look at the sight picture from the side. Usually this set up uses mirrors.

 

[mr11b]

It appeared that way I have just never seen anything like that on any rifle, including an AK.