Gotta tell you, it depends on the scope as well. I like Bobro, but on the Sig 556 is best with a little lower mount to give you a better cheek weld. The size of the objective lens and rear sight height have a lot to do with clearances.
As mentioned you cannot co-witness with magnified sights. Or are you asking for a scope mount that will put the scope centered at the same height as the irons? That is a really tough question for me on that rifle. The only Sig rifle I have is a 522 which is pretty similar dimentionally.
I put a Troy flip on the rear and a Midwest Industries Sig flip on the front. Because mine is a .22 I didn't want to spend a fortune on a scope, but I used the Burris PEPR mount. As an AR mount the PEPR seems a bit high on the Sig rifle.
Hope that info helps a little.
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C'mon man, shouldn't we ban Democracks from Cal-Guns? Or at least send them to re-education camps.
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