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Barrel is threaded 1/2×28 and can accept a suppressor. Full specs here https://angstadtarms.com/product/udp-9-pistol-with-sba3-brace/

My answer is a direct copy and paste from Angstad arms website. Not sure where Edward's source is but its wrоng

Daniel, thread pitch is 1/2 x 28. >>> https://angstadtarms.com/product/udp-9-pistol-with-sba3-brace/ ..... Have a great day!