I can't be the only one, but has anyone else noticed that some backsights except the Mk2 flip-over variants have 2 different size battle sight apertures. The two sizes are .1" and .2". The differences are apparent on the Mk1's, Mk3's and 4's including the Canadianicon variants too.

Have a look if you have a box full to rummage through.......... I've never noticed before and can't find any reference to two different sized battle aperture holes in my paperwork
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