AR QD Tube Lock Back Plate - Sylvan Arms AR-15 QD Lower receiver end plate is a replacement for your standard AR-15 lower receiver end-plate. The Sylvan Arms AR-15 QD lower receiver end-plate is CNC machined from 7075 Billet Aluminum. The three QD sling swivel socket is rotation limited and has three different attachment points for easy ambidextrous use without worry. *This product does NOT work with the Gen 2 or the Gen 3 versions of the Sylvan Arms AR Folding Stock Adapter.* This product, like all other Sylvan Arms products, is also backed by the Sylvan Arms Limited Lifetime Warranty.