The Accessory Cheekpiece (ACP) fits all variants of the B5 Collapsible Precision Stock (CPS). Mounts and adjusts via the undercuts found on the CPS. The ACP adds 3/8" of added height and horizontal adjustment to aid in optimal cheek placement. FEATURES Made of Mil-Spec materials and finish. Soft overmold for increased comfort. Available in all standard colors. SPECS Weight: 2.00 oz. Length: 4.50 in. Width: 2.43 in. Mfg: B5 Systems