The RS9 is a light weight, full auto rated, 9mm suppressor designed around blow-back style pistol caliber carbines. With special design features to reduce the dreaded "port-pop" you hear on typical blow back style actions. The RS9 features a complete 17-4 Stainless steel baffle stack. SPECS Ratings 9MM - Full Auto Rated (No barrel Restriction) 357 Magnum / 38 Special (No barrel Restriction) 300 BLK Subsonic (8\" Barrel or longer) 350 Legend (16\" Barrel or Longer) Length: 7\" Weight: 12.5 Ounces Diameter: 1.370-1.70 Cerakote: Graphite Black Mount: 1.375x24TPI (HUB) - 1/2x28TPI Direct Thread Included