HUXWRX FLOW 556k (OSS) 5.56 Suppressor - Black with Flash Hider

MSRP: $1,406.00
(You save $281.00 )
ships from our shop in 2 to 3 weeks; ATF approval required

HUXWRX FLOW 556k Silencer and Flash Hider Kit - Black

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

First off, the HUXWRX Flow 556K is built to last. The Flow 556K is engineered to be durable enough to pass the SOCOM stress test.
But what really sets the HUXWRX Flow 556K apart is its lack of back-pressure and thus gas in the face of the shooter, while being extremely quiet.  This suppressor is the real deal.

Another great feature of the HUXWRX Flow 556K is its ease of use. It's simple to attach and detach from your gun, so you can switch it out with ease. The HUXWRX suppressor is short, lightweight and engineered and built with the latest in metallurgy and 3-D printing technology.

HUXWRX, formerly OSS, is a premium silencer manufacturer bringing new concepts to market using state-of-the-art technology. Their Flow-Through technology reduces not only blowback on semi and full automatic platforms, but does so while barely changing the host weapon kinematics. By doing this, they have not only saved wear and tear on the gun but lowered the sound impulse experienced by the shooter and the amount of toxic gas exposure. The series of helical coils and core are built layer by layer out of 17-4 using Direct Metal Laser Sintering technology. That's right, these are 3D printed stainless steel, which allows for complex geometry that is impossible with conventional machining. Flash hiding and recoil reducing features are built directly into the can. Torque Lock technology keeps the silencer in place even during full auto fire. Precision manufacturing helps maintain the host weapon's accuracy with minimal and repeatable shift. The FLOW 556k passes the SOCOM test for durability and reliability. C-Series high temp Cerakote holds up to the heat to which silencers are subjected. Go beyond baffles with the HUXWRX FLOW 556k.


  • Optimized for 5.56 hard duty
  • Flow-through technology - near zero back pressure
  • Full Auto Rated - SOCOM passed stress test
  • 3-D Printed Technology
  • 5.5" Length
  • Stainless Steel
  • QD Torque Lock

Overall, the HUXWRX Flow 556K suppressor is an exceptional product that any gun enthusiast should consider adding to their collection. It's built to last, reduces sound and recoil, and is easy to use.  You know that Charlie's likes to present to you they weapons and accessories used by the military and tactical law enforcement teams.  The fact that the FBI selected this, and it has passed SOCOM testing says a lot.  So why wait? Order your HUXWRX Flow 556K today and take your shooting game to the next level! So why wait? Order your HUXWRX Flow 556K today and take your shooting game to the next level!

Common Questions:

QUESTION:  What did Huxwrx used to be called?

ANSWER:  HUXWRX is the successor company to OSS Suppressors.  

QUESTION:  What material is the FLOW 556K made of?

ANSWER:  The Flow 556K is made of 17-4 stainless steel, and is 3-D printed to allow for unique geometries which normal milling cannot produce.

QUESTION:  Who long is the HUXWRX Flow 556K?

ANSWER:  The Flow 556K is rather short, and thus, the "K" name, coming in at only 5-1/2", making it great for short barreled rifles.


  • Caliber: 5.56 NATO - Also compatible with .17 HMR and 5.7X28
  • Length: 5.5"
  • Length Added To Barrel: 4.9"
  • Length Added To Muzzle Device: 3.8"
  • Diameter: 1.6"
  • Weight: 11.8–12.9 oz
  • Material: 17-4 Stainless Steel
  • Finish: Matte Black 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.

"The Flow 556K's Sound Suppression performance at the shooter's ear on the [Mk18 purchased from Charlie's Custom Clones] is unprecedented...  and represents one of the most advanced systems evaluated by Pew Science."  

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

So, what is Charlie's Custom Clones all about?

You may have found us by looking for the Flow 556k, or perhaps just looking for great suppressors, or wondering where all the OSS suppressors went, and that is awesome.  Charlie's specializes in military correct rifles, and the components for tactical rifles for shooting enthusiasts, as well as for military and law enforcement.  We are a small business based in Virginia, and our Potomac Armory is a licensed firearms manufacturer and registered DOD contractor and law enforcement dealer.  In a few short years, our consumer brand, Charlie's Custom Clones has grown to be the leading brand for shooting enthusiasts who are looking to increase their proficiency and their armament collection with military rifles, suppressors, optics and other components, and the hobby of clone building, which is just another way of saying that our customers want to buy or build a military correct rifle, largely as collectors, but also as active operators.  The word, "Clone" in our name scares people that think we have fake products.  We do not.  Nothing can be further from the truth, as to have a clone rifle is to have as exact a copy of an actual military issued weapon as a civilian possibly can have. 

In addition to great combat rifles, we carry a large selection of both military correct suppressors, and popular commercial suppressors.  We are a HUXWRX dealer, and we pick and choose the suppressor companies that we represent, and the products they make.  You can think of us as a curator.  Charlie's directly resells HUXWRX suppressors, as well as a select number of other quality brands.  If we missed a great product that you are looking for, let us know.  Most likely, if it is current production, we can get it for you in short order.

We have online chat during business hours, in addition, you can contact us with product questions on Instagram and Facebook at @charliesclones as well as email and phone support.  Let us know how we can help you, and help to make your shooting sports ambitions come true.  Thanks for stopping in.

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.