Yankee Hill 4401MB24 sRx QD Mini Muzzle Brake Black Phosphate Steel with 5/8"-24 tpi, 9mm, 1.10" OAL & 9.375" Diameter for sRx Adapters

The Yankee Hill sRx QD Mini Muzzle Brake in 5/8"-24 is a quick-detach muzzle device built for shooters who want a compact, low-profile suppressor platform without sacrificing durability or ease of use. Designed to pair with YHM's sRx adapter system, this 9mm-rated brake adds minimal length and weight to your setup while delivering the clean aesthetics and no-fuss operation that define the sRx line. If you're running a precision build, a modern carbine, or any rifle where barrel real estate matters, this is a solid foundation for suppressed shooting.

The standout feature is the internal taper seal—a large, precisely machined taper in front of the threads that locks your suppressor in place and creates a tight seal to contain gases during firing. That design eliminates the thread grime and gas blowback that plague traditional quick-detach mounts, keeping your threads clean and your setup predictable. There's no need to shim or time the brake to your barrel; the YHM sRx system handles that with a no-fuss, repeatable connection every time you attach or detach.

Built from 4140 steel and finished in durable black phosphate, the sRx Mini Muzzle Brake is engineered for serious use. It's lighter than many competing QD offerings on the market and can be left permanently installed on your barrel if you prefer a fixed suppressor mounting solution. The compact footprint—just 1.10 inches long and 0.9375 inches in diameter—keeps your gun's profile sleek without adding bulk.

This is the muzzle brake for the shooter who cares about how their gun looks and feels in hand, not just how it performs. If that's you, the sRx system will pay dividends.

Key Features

• Quick-detach design pairs with YHM sRx adapter system for easy suppressor attachment and removal
• Internal taper seal locks suppressor and contains gases—no thread fouling or blowback debris
• No shimming or timing required; large taper ensures consistent, repeatable mounting
• Compact profile: 1.10" length and 0.9375" diameter add minimal footprint to your setup
• Lightweight compared to traditional QD muzzle devices
• Can be permanently affixed to barrel for fixed-mount suppressor use
• 4140 steel construction with black phosphate finish for corrosion resistance and durability
• No moving parts for reliable, maintenance-free operation

Specifications

Frequently Asked Questions

What adapter do I need to use this muzzle brake?

The sRx QD Mini Muzzle Brake requires the YHM sRx Adapter (YHM-4400) to mount to your suppressor. The adapter interfaces with the industry-standard 1-3/8" x 24 HUB threads found on compatible suppressors.

Can I permanently attach this brake to my barrel?

Yes. The sRx Mini Muzzle Brake can be left permanently installed on your barrel as a fixed mount if you prefer not to use the quick-detach feature.

What's the advantage of the internal taper seal?

The large internal taper in front of the threads locks your suppressor firmly in place and creates a tight gas seal during firing. This design prevents gas blowback and keeps debris from accumulating on the threads, so your mount stays clean and your seal remains consistent shot after shot.

Do I need to shim or time this brake to my barrel?

No. The sRx system is designed to require no shimming or timing. The large taper provides a repeatable, consistent mounting interface every time you attach your suppressor.