Utilizing 17-4 Stainless Steel heat treated to the H900 condition, the Ferox is engineered to be ultra strong without sacrificing durability. Developed specifically for 5.56mm platforms; particularly for short and mid barrel lengths optimizing low back pressure and excellent sound suppression. The Ferox is designed to be used with 5.56x45mm NATO ammunition. The suppressor comes with a 1/2x28 TPI direct thread hub adapter that can be removed so that the suppressor can interface with any industry-standard 1.375x24 TPI hub adapter. *Sound reduction ratings are approximate based on measurements by the manufacturer and may vary depending on firearm setup and environmental factors.*