The optic has a built in 1 inch riser so it works fine for me. I think if I had a stock cheek rest like on your rifle I might want an additional rail riser.
The only drawback to the vortex prism sight is that has fairly short eye relief(~2 inches) so that limits is positioning to pretty much the end of the rail, but whatever. Huge upside to the sight is the HD clear optics and the weight of only 8 ounces. I am very weight sensitive these days plus I appreciate a good optic with my aging eyes. I am tired of lugging around heavy 223/556 black guns that end up feeling like 308 DMRs, so I am very minimalist. No flashlights, lasers, heavy fake cans or 50x optics for me. I got to tell you my favorite setup is the Bren 2 with 11 inch barrel, G36 stock, vortex prism, no back up sights, at just under 7 pounds It has an absolute sublime point ability/feel. I would wear that gun with no complaints all day long if I had to.
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