I have the same sight setup, Sig says this is the standard setup for the sc. I emailed them and explained I was shooting about 2" low at 7yds. They sent me a #9 front replacement at no cost.I have seen some other threads mentioning this but I have a question regarding something Sig customer service told me. Mine has #6 rear and # 8 fronts. I am shooting very low. I mentioned this to customer service and they said it comes with #6 rear sights because the short sight radius requires this. Does this make sense? They are saying I can send it in to have it tested but it would cost me the freight plus range time and ammo cost.
I cannot attest to whether that fixed the issue as I've decided to have X-Ray sights installed.
I emailed [email protected]. He seemed to be very helpful.