A-Tec PMM-6 1/2" - 28 UNEF 9mm silencer  The A-Tec PMM-6 is a high-performance, modular, and lightweight silencer designed specifically for 9mm semi-automatic pistols. It is renowned for its efficiency in sound reduction and minimal impact on the pistol's balance.  Key features include: * Modular Design: The silencer is composed of up to six removable modules, allowing the user to adjust the length and weight to balance sound reduction with compactness. * Effective Muzzle Booster (Nielsen Device): It incorporates a unique spring-loaded piston system that ensures reliable cycling of semi-automatic pistol mechanisms, which is essential for proper function with a variety of 9mm ammunition types. * Durable Construction: The core components, including the boss thread and muzzle booster, are made from stainless steel for longevity, while the main modules are made from black anodized aluminum alloy to keep the weight down (approx. 215g). * High Performance: It is tested to the stringent MIL-STD-1474D military standard and offers significant sound suppression, rated at approximately 36 dB(C).  The 1/2" - 28 UNEF thread version is a common mounting option, compatible with many 9mm pistol barrels designed for suppressors.