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It's clear from the photo that the "arctic" stocked rifle has knobs with 4 lobes.

Every time I see these type of oversize knobs, I wonder if the designers understood that scopes should never...

Probably home improved.


https://www.berger-tools.co.uk/Hand_Knobs_Star_Knobs_Wing__Knurled_Thumb_Screws__Nuts/

I have an experimental c3 one piece mount - kind of an interesting piece.