I installed a Vortex Razor on my .308 gas gun along with a ADM 20 MOA scope mount. Its really nice. Honestly, there is SOOOO much adjustment in the scopes erector that there is no need for 20 MOA. With my scope zeroed at 100 yards, I still have 26 MILS of UP adjustment. There is one small advantage of the canted scope mount and that is it raises the back of the scope up a little giving slightly more room to get to your charging handle. Anyways, Check out the ADM mounts, they are really nice.