The Nov. 2009 issue of Shooting Times' cover article was titled "Scope your M1A!"(shining the light on M1A optic mounts).
It was writen by Joseph von Benedikt. It is a very good study of your problem. If you can not locate it let me know and I will LOAN you my copy.
Dave
Found it:
http://www.shootingtimes.com/2010/09...ourm1a_200911/


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