Sylvan Arms AR15 QD Backplate, Black ARQD100 The Sylvan Arms AR15 QD" quick detach" Tube Lock Backplate replaces your factory backplate and adds three QD attachment points to your rifle. Right" Left" or Middle you can select the QD swivel socket that best meets your needs. This product does not work with the Gen 2 or the Gen 3 versions of the Sylvan Arms AR Folding Stock Adapter.