Angstadt Arms 3-Lug Adapter 9mm A1 Style Flash Hider 1/2x28 Black AA093LHB28. 42 in Weight: 0.7 oz Package Contents: Angstadt Arms 3-Lug A1 Style Flash Hider Angstadt Arms AA093LHB28: 3-Lug Adapter 9mm A1 Style Flash Hider 1/2x28 Black