Two friction fit M3 marksman risers, approximately .5" and .8", have been designed to interface with the Mod 3. These risers can be mounted in six positions, and can be oriented either forward or reverse to provide the end user a unique flexibility in configuring their weapon system. When employed with the BCM Mod 3 Stock it enables a consistent cheek weld when running electro-optics and low powered variable optics set up for passive night vision employment or close-quarter battle.Features :Fits M3 StockIncludes 2 Risers".5" and .8" Heights,