Rich, your gas pedals are mounted in a way that will probably cause you grief. You need to use 3 short screws to secure your optic mount direct to the frame.  The long screws through the *thumb rest [generic]* will 'clamp' the optic mount, but this isn't enough to keep the mount from rocking under the forces of recoil.     Also, I see that your *thumb rest [generic]* is mounted in the back position - I just changed to this back position a month ago and all I can say is wow. Much,