Command Arms Adjustable Cheek Rest for the CBS and PRFCS Ambidextrous design Manufactured from durable polymer with smooth finish Compatible with most existing AR15 carbine style buttstocks with the use of PRFCS Designed for AR-15 and other tactical rifles Provides proper height alignment for using optics, allows more natural heads up position to witness sights Ambidextrous feature, cheek piece is reversible to accommodate left handed firers Provides horizontal adjustment for proper eye relief Lifetime Warranty