Product Description The Angstadt Arms 3-Lug Muzzle Adapter is a tri-lug muzzle device designed to let you quickly attach a compatible pistol-caliber sound suppressor when shooting suppressed. Built around a universal 3-lug interface, it also interfaces with the Angstadt Arms 3-Lug QD Blast Shield for fast on/off use. Constructed from hardened steel and finished in black nitride for durability and corrosion resistance, this adapter installs on 1/2x28 threaded 9mm barrels and does not require shims (shims may be used only if specific timing is desired). Do not use a crush washer. Product Highlights Universal 3-lug interface for fast attachment of pistol-caliber suppressors and compatible accessories Hardened steel construction with a black nitride finish for long-lasting wear and corrosion resistance 1/2x28 thread pitch for common 9mm barrel threading No shims required for installation (shims optional for timing); do not use a crush washer Compact 1.42-inch length and lightweight 0.9-ounce design Specs Brand Name: Angstadt Arms Manufacturer Part Number: AA093LSD28 UPC: 850035894460 Type: 3-Lug Muzzle Adapter (Tri-Lug Adapter) Caliber: 9mm Thread Pitch: 1/2x28 Material: Hardened Steel Finish: Black Nitride Overall Length: 1.42 in Weight: 0.9 oz Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.