Rugged Suppressors RU3 Universal 3 Lug Mount 1/2x28 Thread

The Rugged Suppressors RU3 Universal 3 Lug Mount is a threaded adapter that bridges the gap between HUB-standard suppressors and 3 lug host firearms. If you run a 9mm suppressor with HUB compatibility and want to mount it to an HK-spec 3 lug platform—whether that's a subgun, pistol caliber carbine, or other 9mm host—the RU3 does that job cleanly and directly. It's a bixler-style mount, engineered specifically for handgun and straight wall calibers, making it the right choice for 9mm dedicated systems.

The RU3 solves a real compatibility problem: most modern 9mm suppressors ship with HUB/universal threaded interfaces, but 3 lug barrels require a specific mounting solution. This adapter accepts the 1/2x28 thread from your suppressor and locks into a standard HK-spec 3 lug configuration—the de facto standard for 9mm 3 lug firearms. That means you can use the same suppressor across multiple 3 lug hosts without buying separate mounting hardware for each gun.

A few compatibility notes worth knowing upfront: the RU3 is purpose-built for handgun and pistol caliber applications, not traditional rifle calibers. It's also not compatible with SilencerCo Obsidian suppressors (both the 45 and 9 versions), so if you're running one of those, you'll need a different solution. For everything else in the HUB ecosystem, the RU3 opens up a lot of flexibility.

Key Features

• Accepts 1/2x28 threaded suppressors with HUB standard interface
• Bixler-style 3 lug adapter for HK-spec platforms
• Designed specifically for 9mm and handgun/straight wall calibers
• Enables use of one suppressor across multiple 3 lug hosts

Specifications

Frequently Asked Questions

Will the RU3 work with my HUB-threaded 9mm suppressor?

Yes. The RU3 is designed to accept HUB/universally threaded suppressors and adapt them to 3 lug firearms. As long as your suppressor has a 1/2x28 HUB interface, it will thread onto the RU3.

Can I use this on a rifle or in traditional rifle calibers?

No. The RU3 is rated only for handgun and straight wall calibers. It is not designed or rated for traditional rifle calibers.

Is the RU3 compatible with SilencerCo Obsidian suppressors?

No. The RU3 will not work with either the Obsidian 45 or Obsidian 9. If you use one of those suppressors, you'll need to explore other mounting options.

What's the advantage of a 3 lug mount over other attachment methods?

3 lug mounts are quick-detach, allowing you to attach and remove your suppressor rapidly. They're also the standard for many 9mm subguns and pistol caliber platforms, making them a practical choice for shooters running multiple HK-pattern hosts.