FAB Defense FXRAPSCB RAPS Rapid Adjustment Precision Stock-Collapsible Fits Mil-Spec/Commercial Buffer Tubes Integrated Cheek-Rest & Adjustable LOP Ambidextrous 1Latch System Black PolymerIntegrated Cheek Rest & adjustable Length Of Pull (LOP). Patent pending 1 Latch system, locks both LOP and Cheek Rest height with one lever; can be configured for right or left hand shooters. LOP memory feature; set it once and the adjustable butt pad will spring out to the same length every time. LOP Adjustment Range extension: 32mm (1. 26). Integrated Cheek Rest, adjustment range; 42mm (1. 65). Concealed Picatinny rail at the bottom of the stock for