Rugged's Obsidian9 Suppressor features ADAPT modular technology allows you to have two suppressors with one tax stamp. It is machined from 17-4 stainless steel with three indexing tabs for proper alignment, non-slotted piston, and a revolutionary mounting system. Model: Obsidian9 Caliber: 9mm Luger Color: Black Cerakote OAL: 7.80" Material: Polymer NRR: 121.40 dB Diameter: 1.37" Thread Pattern: 1/2"x28 Weight: 12.70 oz