I can’t figure out how to use these.
You install them as any other mod (they are “rail” type of mod i think so they go in the “rail” slot) and the stats of the mod are applied to to modify weapon performance. Exactly the same as any other modification afaik.
They will likely not do anything unless you have another mod that obscures the weapons base iron sights (It will clearly say it does), like the homemade silencer or scope. This is because the regular iron sights are notably better than the offset sights in every way, so your survivor would never need to use them.