GRS Adjustable Stock, Bifrost Mauser M98 Right Hand Green The GRS Bifrost is made from glass fiber reinforced composite material. The grip and forehand area have a rubber surface – steady and comfortable in any type of weather. Our unique SpeedLock 2.0 system makes it easier to adjust the length and height of the stock, and, importantly, to resist recoil from the heaviest calibers. As with all our stocks, the grip has an angle of six percent so your hand is in its best natural state. The Picatinny Rail mounting system integrates into four different positions on the stock, making it easy to mount light, laser, monopod and other accessories.