B5 Systems CAR-15 Stock is a black synthetic collapsible buttstock designed for AR-platform rifles with mil-spec carbine receiver extensions (tube not included). Faithful to the original CAR15 polymer design, featuring sharp checkering, a fixed sling loop, and an egress channel for cleaning. Includes multiple fixed sling points and an aggressively knurled anti-slip buttplate. Constructed from modern Mil-Spec materials. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use. Comply with local firearm laws and regulations.