Mauser M12 300 Win Mag Bolt-Action Rifle with 24-Inch Barrel for sale. The M 12 blends highest functionality with modern Mauser design: Solid steel construction featuring the distinctive wide Mauser loading breach, extremely smooth bolt movement and classic, straight stock shape with “Prince of Wales” pistol grip. A crisp, direct trigger and 3-position safety SRS for highest safety demands along with target-driven design and perfect balance are what make this rifle an international success.