The BCM Mod 3 Stock is compatible with two friction fit M3 marksman risers, measuring approximately 0.5 inches and 0.8 inches, which can be mounted in six different positions and oriented in either a ""forward"" or ""reverse"" configuration. This design provides users with added flexibility in customizing their weapon system. When used with the Mod 3 Stock, the risers ensure a consistent cheek weld, enhancing performance when utilizing electro-optics or low-powered variable optics that are optimized for passive night vision or close-quarter battle scenarios.