The Yankee Hill Machine sRx Long QD Muzzle Brake 1/2×28 (brand part no. YHM-4405-MB-28) is the full-length brake in YHM’s sRx quick-detach line. It threads onto a 1/2×28 muzzle and, with the sRx adapter on a suppressor, locks the suppressor on through an internal taper seal. The 2.3-inch body gives you more of a muzzle device on the front of the rifle than the Mini version does. Yankee Hill designed the sRx line for a clean, low-profile suppressor setup, and it is made in the USA.

Key Specifications

• The muzzle thread is 1/2×28, the standard AR-15 pitch.
• The device is 2.3 inches long, the longer of the sRx brake bodies.
• It adds 1.675 inches to the barrel on barrels with .6-inch threads, according to Yankee Hill.
• The diameter is .9375-inch, which stays slim at the muzzle.
• It weighs 1.92 ounces, light for a full-length muzzle brake.
• The material is 4140 steel, a tough alloy suited to a muzzle device.
• The finish is black, matching typical rifle hardware.
• The bore opening is sized for 9mm (.390-inch) and smaller calibers, per the maker.
• The design is timeless, so there is no shimming or clocking to the barrel.
• An internal taper seal before the threads locks the device to the sRx adapter and contains carbon buildup.

Frequently Asked Questions

What do I need to mount a suppressor? Yankee Hill specifies that this brake must be paired with the sRx adapter (part no. YHM-4400), which attaches to suppressors with industry-standard 1-3/8×24 HUB threads.

How is the Long brake different from the Mini? The Long brake is 2.3 inches long, while the Mini is 1.1 inches. The Long adds 1.675 inches to a barrel with .6-inch threads, versus .475-inch for the Mini.

Do I have to time this brake? No. The sRx system is timeless and does not need a shim or clocking to the barrel.

Buy the Yankee Hill Machine sRx Long QD Muzzle Brake 1/2×28

For a shooter who wants a proper-length brake that also serves as a quick-detach suppressor mount, the Long sRx is the version to choose. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse more Class 3 parts and accessories while you are here.