Yankee Hill Machine HD 3-Lug Adapter 1-3/8"-24 Thread Stainless Steel Black

The Yankee Hill Machine HD 3-Lug Adapter is a heavy-duty quick-attach mounting solution built for shooters running 3-lug-equipped suppressors and precision-demanding platforms. With a 1-3/8"-24 thread interface, this adapter is engineered to replace standard hub-compatible 3-lug mounts and deliver the durability needed for everything from precision rifle work to full-auto fire. Whether you're running subsonic loads through an AR-9, a 300 Blackout rifle, or a PCC, the HD 3-Lug Adapter provides the strength and reliability that sets Yankee Hill Machine apart.

Built from 17-4 stainless steel in a fully enclosed design, this adapter combines material science with purposeful engineering. The 17-4 alloy is known for its corrosion resistance and ability to handle sustained use and environmental exposure—critical traits for a mount that may live on your rifle through seasons of hunting, training, or tactical work. The black oxide finish complements the stainless construction while adding a layer of wear and corrosion protection.

The HD 3-Lug Adapter uses the HK tri-lug interface, making it compatible with a wide ecosystem of suppressors and quick-attach systems. If you already own a Yankee Hill R9 Sound Suppressor or another HUB-compatible 3-lug can, this adapter gives you the option to swap mounting solutions without replacing your entire suppressor lineup. For full-auto rifles and high-round-count training sessions, the reinforced construction means you're not compromising reliability for the sake of modularity.

This is the kind of upgrade that pays dividends on a dedicated host—especially if you demand longevity and zero wobble in your quick-attach system. Stainless steel construction, purpose-built geometry, and direct HK interface compatibility make this adapter a straightforward choice for serious 3-lug shooters.

Key Features

• 1-3/8"-24 thread pattern for hub-compatible mounting systems
• 17-4 stainless steel construction rated for full-auto use
• Fully enclosed design for added durability and protection
• HK tri-lug interface for broad suppressor compatibility
• Black oxide finish for corrosion resistance
• Quick-attach mounting for rapid suppressor swap capability

Specifications

Frequently Asked Questions

Is this adapter compatible with my existing 3-lug suppressor?

Yes, if your suppressor features an HK tri-lug or hub-compatible 3-lug interface, the HD 3-Lug Adapter will work. This includes the Yankee Hill R9 Sound Suppressor and other HUB-compatible cans. The 1-3/8"-24 thread pattern is the standard for 3-lug mounting systems.

What calibers can I use this adapter for?

The adapter itself is caliber-agnostic—compatibility depends on your suppressor and host firearm. It works with 9mm, 300 Blackout subsonic, and PCC (pistol-caliber carbine) platforms. Always verify your specific suppressor's rated calibers and your host rifle's compatibility.

Will this work on a full-auto rifle?

Yes, the HD 3-Lug Adapter is rated and designed for full-auto use. The 17-4 stainless steel construction and fully enclosed assembly provide the durability required for sustained full-auto fire and heavy use.

What makes this adapter "heavy duty" compared to a standard 3-lug mount?

The HD 3-Lug Adapter uses 17-4 stainless steel with a fully enclosed design, offering superior material strength and corrosion resistance versus standard mounts. This construction is intended to provide added longevity and stability, especially under repeated quick-attach cycles or demanding use.