GBRS Group x Spectre CR-1 Valkyrie Cheek Riser 0.25 inch Black. The Valkyrie comes in three heights to fit the shooter's specific height and desired touch point while still able to utilize the charging handle with the butt stock fully collapsed in order to still be able to perform malfunction drills. Specifications for GBRS Group x Spectre CR-1 Valkyrie Cheek Riser: Manufacturer: GBRS Group Color: Black Features of GBRS Group x Spectre CR-1 Valkyrie Cheek Riser Chamfered edges Carbon fiber-infused nylon construction No special tool needed to remove (Design includes removal slots) Package Contents: GBRS Group x Spectre CR-1 Valkyrie Cheek Riser GBRS Group GEAR-CR1-25BK: x Spectre CR-1 Valkyrie Cheek Riser 0.25 inch Black