This is a BLACKHAWK Cheek Piece known as the Rifle, model 90CP02BK.
Carry your ammo on gun and raise the comb height with Blackhawks Ammo Cheek Pad. Improves alignment when using large tactical scopes. It is constructed of 1000 denier nylon" a non-slip material" for positive cheek weld. There is a zippered utility pouch for external ammunition storage.
Features:
Improved alignment with large tactical scopes
Allows for quick reload and instant visual of ammo status
