I picked up a CR920 yesterday. Seems like it is going to be a good gun, but I have to resolve a few little things before I shoot it. This is a recording of events only and is not intended to be a negative on Shadow Systems. I will reserve that opinion until I understand what the fix is.
While removing the plate from the optics cut, one screw came right out. The 2mm socket head in the other screw gave way and rounded out. I lightly pounded a slightly larger Torx bit in there and it rounded out also. I then lightly pounded a size 0 square drive in there and it came out. One bad screw and about three minutes of wasted time. No big deal.
In the optics mounting chart in the owner's manual, it calls for screw number 2 for the RMSc, which is the cap screw style, but my RMSc does not have a tapered seat on the screw holes. It actually requires the number 1 screw, which is a pan head screw.
The chart also shows that there are two spacers for mounting optics. One is marked with a "+" sign, the other with a "+" sign that has a circle around it. Of the two that came in the bag, one has the "+" with a circle around it(which the Shield calls for), the other just has a circle on it. The instructions say that the spacer should be installed first, then the optic should be lightly pressed into the pocket to make sure it is down flat against the bottom. Mine does indeed sit flat on the bottom, but then the screw holes are misaligned by about half of a hole. When I bolt the optic on without the spacer installed in the front of the pocket, there is a gap between the rear of the optic and the back wall of the pocket.
I called tech support and left a message early this afternoon. I am curious what they will have to say. It is entirely possible that I may be doing something wrong, but I can't see it. I would swallow my pride for a simple fix...
I will update after I hear from tech support.
I will add that the screw thread engagement with the Shadow Systems cut is the best I have seen so far.
Gap in front. That is where the spacer is supposed to go.
Gap in the back when screw holes are aligned.