A screw from the right side that snugs them up against the starboard side of the receiver (the underside of the rail area) - just takes an allen wrench and some loctite and they're solid.
I'm partial to the offset irons, especially paired with variable optics that are 1-Nx zoom. With the low powered variables, they function like fixed BUIS when I'm using the low powered variable at night (a backup if needed), and in the daytime when I'm at higher zoom they're just a flip-away 1x sighting option. Yes, I realize that the offset irons haven't changed the function in any way, but they're providing different handy utility in both configurations of the scope I'm using them alongside, and that's why to me the irons are the better option when using a low powered variable.
On a higher zoom rifle (e.g. .308 AR with a 2.5-10x optic) I see a much better case for an offset red dot, since there isn't such a readily available option for it to have a quick reflex sighting capability.
عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
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Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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