The B5 Systems CAR-15 stock is a retro-styled fixed buttstock for AR-platform rifles. It is a solid, non-collapsible stock that mounts on a standard mil-spec receiver extension for a rigid, consistent cheek weld. The mil-spec polymer body carries B5's checkering and a knurled anti-slip butt plate. Features: Fixed (non-collapsible) CAR-15-style buttstock Mil-spec polymer construction Multiple fixed sling attachment points Knurled anti-slip butt plate with checkering Egress channel Roughly 4.2 oz; about 6.21 inches long; Olive Drab Green finish Fits standard mil-spec receiver extensions only. It does not fit commercial-diameter buffer tubes. Confirm your receiver extension is mil-spec before ordering.