OSS RAD PISTON 1/2-28 - High-Performance Suppressor Accessory

The OSS RAD Piston 1/2-28 is a precision suppressor accessory engineered for shooters running reciprocating-bolt host firearms with OSS suppressors. This piston pairs with OSS RAD 9 and RAD 45 cans and uses a spring-loaded design to cycle the action on your host gun—keeping your suppressor anchored while the bolt does the work. Built from 17-4 stainless steel and treated with black nitride finish, it resists wear and corrosion in hard-use conditions, whether you're running subsonic loads at the range or downrange in less-than-ideal weather.

Cross-compatibility matters in the suppressor world, and the RAD Piston 1/2-28 plays well with other platforms: it's interchangeable with SilencerCo and Rugged suppressor pistons, giving you flexibility if you ever swap hosts or cans. The wrench flats machined into the piston body make installation and removal straightforward—grip it with a wrench for a rock-solid connection to your barrel, no guessing or spinning.

Pair this piston with a spring (sold separately) to set up a reciprocating-bolt suppressor rig, or choose a fixed-barrel spacer if your setup calls for a static configuration. The 1/2-28 thread pitch is standard on most rifle platforms, so compatibility is wide—check your host firearm's muzzle before ordering to confirm the fit.

Key Features

• 17-4 stainless steel with black nitride finish for durability and corrosion resistance
• Compatible with OSS RAD 9 and RAD 45 suppressors
• Cross-compatible with SilencerCo and Rugged suppressors
• Wrench flats for secure, no-slip installation and removal
• Works with spring-loaded reciprocating-bolt setups or fixed-barrel spacer configurations
• 1/2-28 thread pitch (standard rifle muzzle)

Specifications

Frequently Asked Questions

What firearms and suppressors does the OSS RAD Piston 1/2-28 work with?

The 1/2-28 piston is designed for OSS RAD 9 and RAD 45 suppressors and is cross-compatible with SilencerCo and Rugged suppressors. It threads onto any firearm with a 1/2-28 muzzle. Always verify your host gun's muzzle thread pitch before purchasing to ensure proper fit.

Do I need a spring with this piston, or does it come with one?

The piston itself does not include a spring. For a reciprocating-bolt setup, you'll need to pair it with a spring (sold separately). Alternatively, you can use a fixed-barrel spacer if your configuration calls for a static mount rather than a moving piston.

How do I install the OSS RAD Piston 1/2-28?

The piston features wrench flats that allow you to grip it securely with a wrench during installation and removal. This design prevents slipping and ensures a tight, reliable connection to your barrel.

Is this piston compatible with other suppressor brands?

Yes. The OSS RAD Piston 1/2-28 is interchangeable with pistons from SilencerCo and Rugged Suppressors, giving you flexibility across multiple platforms and host firearms.