The Yankee Hill Machine sRx QD Flash Hider (brand part number YHM-4405-28) is cut with 1/2×28 threads and built as the flash hider half of YHM’s sRx Quick Detach suppressor mounting system. An internal taper seals in front of the threads to lock a compatible sRx suppressor mount in place and keep gas and fouling from building up on the threads, while the flash hider itself works as a standalone muzzle device even without a suppressor attached. YHM machines it from 4140 steel and finishes it in black phosphate, adding only 2.3 inches of muzzle device length and 1.675 inches to the barrel on guns using 0.6-inch threads. Because it never needs to be shimmed or timed to the barrel, it mounts once and stays put, whether run alone or paired with the sRx Adapter for quick-detach suppressor use.

Key Specifications

• Functions as a QD flash hider, the muzzle half of YHM’s sRx mounting system.
• Internal taper seals in front of the threads, keeping gas and fouling off the threads.
• Compatible Q.D. Adapter interface uses an industry-standard 1-3/8-inch x 24 thread hub.
• Machined from 4140 steel for durability.
• Finished in black phosphate.
• Threaded 1/2×28 for standard 5.56/9mm-class muzzles.
• Rated for 9mm (.390-inch diameter) or smaller bore calibers.
• Muzzle device length measures 2.3 inches.
• Adds 1.675 inches to the barrel on guns using 0.6-inch threads.
• No shimming or timing to the barrel required for installation.

Frequently Asked Questions

Does this work without a suppressor? Yes, it functions as a standalone flash hider and only needs the sRx Adapter to add quick-detach suppressor capability.

What calibers is it rated for? 9mm (.390-inch bore diameter) or smaller.

Does it need to be timed or shimmed? No, the taper design mounts consistently without shimming or clocking to the barrel.

Buy the Yankee Hill Machine sRx QD Flash Hider – 1/2×28 Thread

Build a low-profile, quick-detach-ready muzzle setup with YHM’s sRx system. Order it from our Yankee Hill Machine lineup, part of our Class 3 parts and accessories selection, at our Lubbock, Texas gun shop for fast, direct shipping.