FAB Defense GL-Core S CP Buttstock is a matte black fiberglass reinforced polymer CQB-optimized combat buttstock, including the GL-Core S stock and GCCP Cheek Rest (3-position adjustable) designed to support optics and holographic sights. Fits Mil-Spec or Commercial buffer tube diameters via interchangeable buffer tube adapters (tube not included). Compact and short for CQB scenarios while providing strength for mid-range engagements. Features a flat-faced rubberized buttpad usable with or without body armor, two integrated QD rear sling swivel connectors for SLS sling attachments, and an inverted positioning lever to prevent accidental opening. Compatible with AK, VZ, and shotgun platforms; on the AR platform, the CP may obstruct charging handle use when fully collapsed removal is recommended for AR use. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use, especially when using the cheek rest on AR-platform rifles, as it may obstruct charging handle operation when collapsed. Comply with local firearm laws and regulations.