HUXWRX FLOW 556K Suppressor - FDE with Flash Hider

MSRP: $1,406.00
(You save $281.00 )
Requires ATF approval: ships to your local dealer generally in 3 weeks after confirming FFL and SOT licenses

HUXWRX FLOW 556k 5.56 NATO Silencer and Flash Hider Kit - Flat Dark Earth

The FBI's new issue silencer brings amazing performance in a compact package using bleeding edge manufacturing technology.

Experience an unrivaled blend of power, stealth, and innovative technology with the HUXWRX FLOW 556k 5.56 NATO Silencer and Flash Hider Kit. Formerly OSS, HUXWRX brings its premium manufacturing expertise and state-of-the-art technology to create a product that goes beyond your expectations.

Bleeding-Edge Manufacturing Technology:  Boasting the FBI's new issue silencer, the HUXWRX FLOW 556k brings unprecedented performance in a compact, durable package. It showcases an exquisite combination of breakthrough manufacturing methods like Direct Metal Laser Sintering (DMLS) to create a 3D-printed stainless steel masterpiece.

Unique Flow-Through Technology:  Say goodbye to blowback on semi and full-automatic platforms. The patented FLOW-Through technology by HUXWRX not only lowers the sound impulse but significantly reduces toxic gas exposure.

Superior Material and Design:  Made from 17-4 Stainless Steel, the HUXWRX FLOW 556k's series of helical coils and core are built layer by layer. This construction allows complex geometry that is virtually impossible with conventional machining methods.

Built-in Flash Hiding and Recoil Reducing Features:  The flash hiding and recoil reducing features are seamlessly built into the silencer. This combined with the Torque Lock technology ensures the silencer stays in place, even during full auto fire.

Tested and Trusted Performance:  The FLOW 556k doesn’t just claim excellence, it proves it. Passing the rigorous SOCOM test for durability and reliability, this silencer is guaranteed to deliver every time.


  • Caliber: 5.56 NATO - Also compatible with .17 HMR and 5.7X28
  • Length: 5.5"
  • Length Added To Barrel: 4.9"/12.4 cm
  • Length Added To Muzzle Device: 3.8"
  • Diameter: 1.6"
  • Weight: 11.8–12.9 oz
  • Material: 17-4 Stainless Steel
  • Finish: FDE C-Series High Temp Cerakote
  • Mount Compatibility: Muzzle Brake-QD 556 and Flash Hider-QD 556
  • Includes: One 1/2X28 Flash Hider-QD 556

We at Charlie's are proud to sponsor Pew Science and highly recommend seeing what the research says about this high performance suppressor. The detailed review can be found here.

An inside look at how the FLOW 556k is manufactured.


Q1: What technology does the HUXWRX FLOW 556k use to reduce blowback?

  • A1: The HUXWRX FLOW 556k uses patented FLOW-Through technology to effectively reduce blowback on both semi and full-automatic platforms.

Q2: How does the HUXWRX FLOW 556k maintain stability during full-auto fire?

  • A2: The HUXWRX FLOW 556k integrates Torque Lock technology to keep the silencer in place even during full-auto fire.

Q3: What materials is the HUXWRX FLOW 556k made of?

  • A3: The HUXWRX FLOW 556k is crafted from 17-4 Stainless Steel using Direct Metal Laser Sintering (DMLS), enabling complex geometry unachievable by traditional machining methods.

Q4: What tests has the HUXWRX FLOW 556k passed to ensure its durability and reliability?

  • A4: The HUXWRX FLOW 556k has successfully passed the USSOCOM test for durability and reliability, reinforcing its excellent performance and longevity.

Q5: What is the unique feature of the HUXWRX FLOW 556k in terms of design?

  • A5: The unique design of the HUXWRX FLOW 556k incorporates a series of helical coils and core, flash hiding and recoil reducing features built directly into the silencer for unparalleled efficiency and performance.

Q6: Is the HUXWRX FLOW 556k compatible with other calibers besides 5.56 NATO?

  • A6: Yes, the HUXWRX FLOW 556k is also compatible with .17 HMR and 5.7X28.

Q7: What additional components does the HUXWRX FLOW 556k include?

  • A7: Each HUXWRX FLOW 556k kit includes a 1/2X28 Flash Hider-QD 556.

Q8: What is the length and weight of the HUXWRX FLOW 556k?

  • A8: The HUXWRX FLOW 556k measures 5.5" in length and weighs between 11.8 oz.

Q9: What is the finish of the HUXWRX FLOW 556k?

  • A9: The HUXWRX FLOW 556k features an FDE C-Series High Temp Cerakote finish, offering superior heat resistance.

Q10: How does the HUXWRX FLOW 556k affect the kinematics of the host weapon?

  • A10: Thanks to its innovative design and technology, the HUXWRX FLOW 556k minimizes alterations to the host weapon kinematics, preserving its original functionality and accuracy.

NOTE: Due to the change from OSS to HUXWRX, the manufacturer is using the rest of the OSS branded packaging on hand to minimize waste. There is chance your product may arrive in an OSS box.

Buying and shipping through Charlie’s is easy, but there is some information you need to know. This item must ship to FFL holder. No civilian exceptions.

        1)  Check your state laws to make sure the federally regulated item you want to purchase is legal in your state.

        2)  Find your FFL… Have your dealer send us a copy of their FFL and SOT to Charlie’s (Make them earn their fee!). Not every FFL is a SOT or Class 2 / Class 3 dealer.  

        3)  Be patient! You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.

That’s it! We try to make this process as simple as possible for our customers. Please click the “Buying a Firearm” tab at the top of this page for more information.