The BCM Mod 3 Stock Riser Kit provides precision cheek weld adjustment with two friction-fit risers (.5" and .8") designed specifically for BCM Mod 3 stocks on AR rifles.BCM Mod 3 Stock Riser Kit - BlackTwo friction-fit M3 marksman risers includedApproximately .5" and .8" height optionsSix mounting positions with forward or reverse orientationCompatible with BCM Mod 3 Stock systemsOptimized for electro-optics and low powered variable opticsEssential for tactical operators using night vision and close-quarter battle setups these risers ensure consistent cheek weld and improved sight alignment when running optics on AR rifle platforms.