A1 versus A2 peep scallop direction

[Scalarworks]

Can anyone tell me why the scallop on the A2's small peep aperture was flipped around as compared to the A1's?

[Jefe73]

Reviving this because the answer would be an interesting bit of trivia, if anyone knows.

[GRA556]

Interesting ... I never noticed it was.

[JasonB1]

I have read some info that the A2 semi spherical aperture was a variation (not necessarily a good one) of the recessed face on match type sight apertures.

The A1 apertures appear more cone shaped from what I can see and look a lot like the hole from a pilot drill. Not sure why unless the back side was to act as a relief cut to achieve a smooth hole maybe?

FAL rear sights have that cone shaped cut on the back side also.