I thought you might be interested in looking at How to zoom in / out the field of view when aiming using the iron sight in arma cwa 1.99?.
https://forums.bohemia.net/forums/topic/236822-how-to-zoom-in-out-the-field-of-view-when-aiming-using-the-iron-sight-in-arma-cwa-199/?do=findComment&comment=3450241
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