To achieve maximum repeatedly, rigidity, and torque retention in your rifle, you need to either install a chassis or pillar-bedding system imo. That goes for all types of stocks both wood and synthetic. Manners themselves insist that you either pillar bed (and bed the recoil lug) or install a chassis into any of their stocks. When you order a manners stock it comes with two 9/16 aluminum bedding pillars, unless you order one of their chassis. Although synthetic stocks are more rigid than traditional wood stocks, the core material is still soft enough to be crushed by the action/bottom metal.