OSS RAD 45 Suppressor

Product Description

The OSS RAD 45 suppressor is a sound suppressor designed for use with pistol calibers up to and including .45 ACP. It brings OSS design engineering to handgun platforms where shooters want to reduce report and muzzle blast without adding excessive length or weight to the firearm.

This suppressor works across multiple common pistol calibers. That versatility makes it a practical choice for shooters who run different handguns and want one can to serve several roles.

Because the RAD 45 is a serialized NFA item, you’ll complete an ATF Form 4 transfer before taking possession. An approved form is required, and current wait times vary. Our FFL/SOT team handles the paperwork from start to finish.

Key Facts

• Brand: OSS
• Model: RAD 45
• Product Type: Suppressor
• SKU: OSS-1820H

What the RAD 45 Fits

The RAD 45 is rated for pistol calibers through .45 ACP. That includes 9mm, .40 S&W, 10mm Auto, and .45 ACP, among others. Multi-caliber capability means you can move one suppressor between different host firearms, provided each is threaded and the thread pitch matches your mounting solution.

Thread pitch is critical. Most pistol barrels use 1/2×28 for 9mm or .578×28 for .45 ACP, but you should verify the threading on your barrel before ordering any suppressor. Send us a message if you need help confirming compatibility with your specific handgun.

How Pistol Suppressors Compare

Pistol suppressors vary widely in baffle design, size, and how much back pressure they create. Some designs keep gas and carbon out of tilting-barrel actions better than others. The RAD 45 uses a baffle stack approach, common in the category, but specific performance details should be confirmed directly with the manufacturer or by calling our shop.

Choosing between a .45-rated can and a dedicated 9mm suppressor often comes down to your inventory. A .45 can handles anything smaller, but a 9mm-only design may be lighter and more compact. If you shoot multiple calibers, the RAD 45 gives you that flexibility in one serialized item.

NFA Transfer Process in Texas

Buying a suppressor requires an approved ATF Form 4. You’ll submit fingerprints, a passport photo, and the transfer tax, then wait for ATF approval. An approved form is required before you take possession; see our NFA wait times guide for current approval times.

Western Sport is a licensed FFL/SOT dealer. We handle the Form 4 paperwork, coordinate with your chosen trust or individual filing, and store the suppressor until your approval arrives. Texas law does not add additional state-level restrictions on NFA items beyond federal requirements.

Ordering from Western Sport

Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: What calibers can the OSS RAD 45 suppressor handle?

A: The RAD 45 is rated for pistol calibers through .45 ACP. That includes 9mm, .40 S&W, 10mm Auto, and .45 ACP. You can use one suppressor across multiple handguns as long as each is threaded and you have the correct mount or piston for the thread pitch.

Q: How long does the ATF Form 4 transfer take for the RAD 45?

A: An approved ATF Form 4 is required before you take possession; see our NFA wait times guide for current approval times. Wait times fluctuate based on ATF workload and whether you file as an individual or through a trust. Western Sport handles the paperwork and notifies you when your approval arrives.

Q: Can I use the RAD 45 on a rifle chambered in pistol calibers?

A: You can use the RAD 45 on pistol-caliber carbines and rifles as long as the caliber is within the suppressor’s rating and the barrel is threaded to match your mount. Many shooters run .45-rated cans on 9mm PCCs for exactly that reason. Send us a message to confirm your specific setup.

Q: What is the difference between the RAD 45 and a 9mm-only suppressor?

A: A .45-rated suppressor like the RAD 45 handles any pistol caliber up to .45 ACP, while a 9mm-only can is typically lighter and more compact because it is built for lower pressures and smaller projectiles. If you shoot multiple calibers, the RAD 45 offers flexibility. If you only shoot 9mm, a dedicated 9mm suppressor may be a lighter option.

Q: Do I need a threaded barrel to use the OSS RAD 45?

A: Yes, your pistol or host firearm must have a threaded barrel that matches the mount or piston you use with the RAD 45. Most aftermarket barrels are available in common thread pitches, and many factory models now ship threaded. Verify your barrel threading before ordering any suppressor to ensure proper fit.