The Primary Weapons Systems 1/2x28 Piston is a suppressor adapter designed to run PWS suppressors on rifles threaded with the common 1/2x28 muzzle pattern. If you're building or upgrading an AR-15, 5.56 rifle, or any other platform with 1/2x28 threads and want to add sound signature reduction, this piston gives you direct access to PWS's purpose-built suppressor line. The anodized black finish resists corrosion and blends with modern tactical aesthetics.

Primary Weapons Systems built their reputation starting in 2008 by designing and testing muzzle devices across a wide range of platforms—from direct-impingement M4s to long-stroke AK variants. That real-world testing revealed a critical insight: piston-driven systems generate significantly different carbon and heat signatures than conventional direct-impingement designs, which means suppressor-equipped piston guns accumulate fouling at a different rate. PWS engineered their piston system to work seamlessly within the AR platform while minimizing maintenance demands during sustained or rapid fire and in harsh field conditions.

This 1/2x28 piston bridges that philosophy to your suppressor mounting. If you already own or plan to add a PWS suppressor, this adapter ensures compatibility with your 1/2x28-threaded barrel. It's a straightforward, no-nonsense part that handles the interface between your muzzle and the suppressor itself.

The Primary Weapons Systems 1/2x28 Piston is a suppressor adapter designed to run PWS suppressors on rifles threaded with the common 1/2x28 muzzle pattern. If you're building or upgrading an AR-15, 5.56 rifle, or any other platform with 1/2x28 threads and want to add sound signature reduction, this piston gives you direct access to PWS's purpose-built suppressor line. The anodized black finish resists corrosion and blends with modern tactical aesthetics.

Primary Weapons Systems built their reputation starting in 2008 by designing and testing muzzle devices across a wide range of platforms—from direct-impingement M4s to long-stroke AK variants. That real-world testing revealed a critical insight: piston-driven systems generate significantly different carbon and heat signatures than conventional direct-impingement designs, which means suppressor-equipped piston guns accumulate fouling at a different rate. PWS engineered their piston system to work seamlessly within the AR platform while minimizing maintenance demands during sustained or rapid fire and in harsh field conditions.

This 1/2x28 piston bridges that philosophy to your suppressor mounting. If you already own or plan to add a PWS suppressor, this adapter ensures compatibility with your 1/2x28-threaded barrel. It's a straightforward, no-nonsense part that handles the interface between your muzzle and the suppressor itself.