Angstadt Arms 3-Lug Muzzle Adapter Features The Angstadt Arms 3-Lug Muzzle Adapter is crafted from hardened steel providing exceptional durability and strength. The black nitride finish enhances the adapter s resistance to wear and corrosion ensuring a long service life. This adapter is designed with a 1/2x28 thread pitch making it compatible with a wide range of 9mm firearms. This muzzle adapter does not require the use of shims though they can be used if specific timing is desired. It is important to note that a crush washer should not be used with this adapter. Measuring 1.42 in length and weighing just 0.9 oz this adapter is lightweight and easy to install making it a convenient addition to your firearm. Angstadt Arms 3-Lug Muzzle Adapter Specifications Manufacturer: Angstadt Arms Model: 3-Lug Muzzle Adapter Caliber: 9MM Thread Pitch: 1/2x28 Length: 1.42 Weight: 0.9 oz Finish: Nitride Color: Black Material: Hardened Steel