Sco Piston 1/2"x28 Xl

The SilencerCo Piston 1/2"x28 XL is a precision-engineered Nielsen device component built to cycle semi-automatic pistol actions when paired with threaded barrels. Manufactured from 17-4 stainless steel and heat-treated for maximum durability, this piston enables reliable unlocking of fixed or semi-automatic host barrels depending on your suppressor configuration and intended use.

The 1/2"x28 thread pattern serves as the industry standard for most 9mm and .45 ACP centerfire pistols, while the XL designation identifies this as the larger variant within SilencerCo's piston lineup. Female threading on the piston attaches directly to SilencerCo's threaded barrels, and the modular design allows shooters to swap pistons between different host firearms or calibers without replacing the entire suppressor assembly. For fixed-barrel applications, a separate fixed barrel spacer (sold separately) can be added to the system for configurations where semi-automatic cycling is not required.

This component is essential for operators, competitive shooters, and trained civilians who suppress pistol caliber firearms and require reliable bolt-back cycling during semi-automatic fire. The robust 17-4 stainless steel construction resists corrosion from repeated firing, cleaning solvents, and environmental exposure. Quick piston swaps make this system practical for shooters who run multiple suppressors or host firearms and need to configure their suppressor stack for different operational profiles without field-stripping the suppressor body itself.