HUXWRX Safety Company Ventum 556, Suppressor, 556NATO, Nitride QPQ Finish, Black, 17-4PH Stainless Steel, 1/2x28 Direct Thread 2904 The latest in the VENTUM series the VENTUM 556 brings HUB compatible Flow-Through technology to dedicated 5.56 weapon systems. With a removeable 3D-printed Grade 5 Titanium core and 17-4 stainless steel suppressor housing, the VENTUM 556 is easily serviceable and provides all the benefits of true Flow-Through technology including toxic fume mitigation, improved sound performance, and excellent repeatability.