Comp Stock like the Knoxx Comp Stock is an overmolded stock with a spring like device that functions similar to a shock absorber. Early concerns with these possibly
compromising accuracy have been voiced by a few however those who have tried these disagree. My 300 WM remains a sub 1 MOA gun @ 600 yrds and I can shoot it all day long. Prior to changing to the new comp stock I would tend to shy away after 3-4 rounds....not that I would ever Fl**ch.
One word of caution is making certain you have enough eye relief, with the stock compression absorbing recoil, 1-2 inches of eye relief could be problematic. I would recommend 3-4 inches.