New latest production HDPS HK USC/UMP Stock Block -B

For Use With All HK UMP Factory Or US Made Folding Stocks. Each unit comes with the new push pin design. This is a required part for the HK USC-UMP style conversion. Each part is the latest US-made HDPS production part available with the new scratch-resistant coating & finish & latest generation upgrades. Each unit comes with the locking pin and stock block assembly.