Yankee Hill 4405MB24 sRx Q.D. Muzzle Brake Long Black Phosphate Steel with 5/8"-24 tpi, 9mm, 2.30" OAL & 9.375" Diameter for sRx Adapters

The Yankee Hill sRx Q.D. Muzzle Brake (4405MB24) is a quick-detach muzzle device built for shooters who want a low-profile suppressor setup without the hassle of timing. Threaded 5/8"-24 and machined from 4140 steel with black phosphate finish, this 9mm-rated brake is engineered around the YHM sRx suppressor system—a no-shim mounting platform that locks on securely and seals gases cleanly at the threads. If you're running a suppressor on a 9mm pistol or rifle, this is the mounting interface that keeps your build clean, compact, and field-proven.

What sets the sRx system apart is simplicity: no timing, no shims, no guesswork. The internal taper seal forms a consistent, gas-tight connection every time you mount or remove your suppressor, so thread fouling becomes a non-issue. At 2.30" overall length and designed to add just 1.675" to your barrel, the sRx brake adds minimal footprint compared to traditional Q.D. muzzle devices, keeping your sight picture and handling uncluttered. The large taper geometry is YHM's answer to shooters who demand both aesthetics and durability—no moving parts to wear or fail, and no compromise on recoil management when used without a suppressor.

Built from the ground up for the YHM sRx system, this brake mates to the standard HUB 1-3/8" × 24 thread interface on compatible YHM suppressors, making it a direct bolt-in for anyone adopting the ecosystem. Whether you're building a precision 9mm host or swapping hosts mid-range, the sRx brake eliminates the frustration of aftermarket compatibility and keeps your suppressor work straightforward.

Key Features

• Quick-detach sRx mounting system—no timing or shimming required
• Internal taper seal prevents gas blowback and thread fouling
• Compact 2.30" length adds minimal profile to your setup
• 4140 steel with black phosphate finish for durability
• 9mm (.390 diameter) caliber rated
• No moving parts—reliable and low-maintenance

Specifications

Frequently Asked Questions

What suppressor does this muzzle brake work with?

The sRx Q.D. Muzzle Brake is part of the Yankee Hill sRx System and attaches to YHM suppressors equipped with the industry-standard HUB 1-3/8" × 24 thread interface. It is not compatible with standard suppressor mounts.

Do I need to time this brake to my barrel?

No. The sRx system eliminates timing and shimming. The large internal taper seal locks your suppressor in place and forms a consistent, gas-tight connection without adjustment.

What caliber is this rated for?

This brake is rated for 9mm (.390 diameter) and smaller calibers.

Can I use this brake without a suppressor?

Yes. When used alone, the sRx Q.D. Muzzle Brake functions as a standard muzzle device. You can also permanently attach it to your barrel if desired.