The Archangel Six-Position Collapsible Butt-Stock can be installed on all commercial-series buffer tubes. This collapsible butt-stock from Archangel is constructed of durable carbon-fiber filled polymer to offer the highest strength. Features include an ambidextrous QD sling-swivel inserts at the front and rear of the butt-stock, and a slot for attaching a web-sling. The multi-position adjustability allows shooters of all sizes the chance to shoot comfortably. Does NOT include the buffer tube.