Seriously guys...if you don't have the coin to do it right, do yourself a favor and stay with iron sights. I wrote an article about this a year ago - here is the link
Recently on a SIG Legion Group on Facebook I saw this post -
I've been waiting for the development of a P226SAO RX Legion. Then this happened to my P320RX - while it was in my gun bag, apparently from the bag being set on the garage floor.
I carry my 226 every day. It sits on my right hip, and knocks into the center console of my car every moment I'm behind the wheel. Now I'm frustrated because the one improvement I have craved for my Legion seems not ready for daily carry.
Well...to quote our Grandmothers...I told you this would happen!!