Lightweight and modular, the RAD 9 is built with their next generation Flow-Baffle technology, substantially reducing gas blowback while maintaining superior pistol performance. Youll feel the difference the first time you shoot. OSSs innovative Flow-Baffle design is based on their patented and proven Flow-Through technology. Flow-Baffles direct expanding gas away from the bore-line, and radial grooves route them forward through the suppressor and away from the shooter.Features :Rated for calibers up to 9MMDirect thread attachment, 1/2x28Full-Auto ratedIncludes 1/2-28 piston