Mounts on Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others; Improves ease of adjustment while securing LOP placement, limiting secondary movements, and improving durability; Single, anti-snag ambidextrous control lever; Newly designed non-slip butt-pad with optimized curvature allows for easier shoulder transitions and better fit when using body armor; Sloping cheek weld combines a slim profile with user comfort; Compatible with the Magpul CTR Cheek Risers for use with a fully extended stock and on rifles without rear-facing charging handles; Compatible with Magpul ASAP, ASAP QD and other receiver-mount sling attachments; Rotation-limiting, integral push-button QD swivel sling mount accommodates up to 1.5" swivels (ambidextrous)