Gents, I just bought a decent 99 for two reasons. First, was the nice original sling it wore, but second is something I've never seen before and can't find ANY info on anywhere. A small tin cover on the top of the rear sight. It attaches with the little screw that I always thought just retained the slider.

It is an all matching rifle, intact mum, but no monopod or dust cover.

Any ideas?
Thanks!
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