Nice gun, and nice review. I have the S410 SL and LOVE IT. I've been considering modifying the stock to make the cheek piece adjustable and did have to make a dove tail extension to enable me to mount the scope far enough forward tl lay down behind the rifle in a sling. The S510 XS would be a nice addition. It takes care of the cheek piece elevation. And it shoots a nice group at 100 yards!