FAB Defense Adjustable Cheek Riser Black. Adjustable Cheek Risers from FAB Defense will perfectly align the eye with the iron sights or Rifle Scope. This FAB Defense Weapon Accessory is shaped for a comfortable and consistent cheek rest with your FAB Defense GLR16 or GL-Shock M4/AR-15 Stocks. For more weapon accessories from FAB Defense please visit our FAB Defense Weapon Accessory page. Specifications for FAB Defense Adjustable Cheek Riser: Manufacturer: FAB Defense Condition: New Features of FAB Defense Adjustable Cheek Riser: Fully Adjustable Cheek Rest Optional Dual Picatinny Rails Easy to Attach and Dismantle Lightweight and Strong Easy to Install No Gunsmith Required Package Contents: FAB Defense Adjustable Cheek Riser FX-GSCP