The Sportsman Ultra Light HD .300 is a lightweight, durable suppressor designed by hunters for hunters. Full 17-4 Stainless Steel construction brings a new paradigm of durability to the Sportsman Ultra Light family of suppressors, hence the HD (High Durability) designation. Tubeless laser-welding, a silencer technology pioneered by Griffin, affords near-titanium weights using much more durable 17-4 H900 heat-treated stainless steel. The Sportsman Ultra Light HD .300 is compatible with HUB devices and utilizes the common 1.375x24 TPI threading. This product includes a 5/8x24 direct thread adapter. *Sound reduction ratings are approximate based on measurements by the manufacturer and may vary depending on firearm setup and environmental factors.*