HUXWRX QD Mount: How the Flow 556K Goes On
HUXWRX QD is the mount behind the Flow cans. The can threads on by hand and seats on a taper; there is no collar or latch. See it go on in 3D, then the mounts and cans in stock.
Quick answer
- HUXWRX QD (HUXWRX): HUXWRX's QD: the Flow can threads on hand tight and seats on a taper. No collar, no latch.
- The GunPartPicker catalog lists 29 HUXWRX QD mounts and adapters and 10 cans that ship on HUXWRX QD in stock right now.
- HUXWRX QD cans only seat on HUXWRX QD mounts. None of the quick detach systems interchange.
Source: GunPartPicker catalog and build data, prices checked October 28, 2026.
How the HUXWRX QD mount works, in 3D
Pick a system. Drag to turn it, take the can off to see the mount, or cut it open to see the threads, the taper and the baffles. Try a can from another system to see why they don't swap.
HUXWRX QD mount + HUXWRX Flow 556KHUXWRX · 1/2x28 · look-alike can model
- Mount
- HUXWRX QD (HUXWRX)
- Suppressor
- HUXWRX Flow 556K
- Barrel
- 11.5" SBR
- Mount adds
- 1.6", mostly in the can
- Rifle, no can
- 30.3" overall
- With the can on
- 36" overall
Overall length with the M4 stock extended. With the HUXWRX QD can builders add most, the HUXWRX Flow 556K 5.56 NATO Flow-Through Suppressor (FDE) - 2159, whose listing gives no length, counted at a typical 6.5".
- No can, 5.56 AR165 dB
- Dead Air Sandman X142 dB−23
- SureFire SOCOM RC2137.7 dB−27
- SilencerCo Velos LBP137.1 dB−28
- SilencerCo Omega 300130.1 dB−35
- HUXWRX Flow 556Kno published figure
Dashed line: 140 dB, the peak OSHA and NIOSH set for unprotected impulse noise. Every 10 dB is ten times the sound energy. Even suppressed, a short 5.56 sits near or above the line, so keep hearing protection on. Makers meter at the muzzle or at the ear, on different barrels; each row says how: No can, 5.56 AR about 165 dB from a 16" barrel; an SBR's shorter barrel is louder still; Dead Air Sandman X at the muzzle, 10.3" Mk18, MIL-STD-1474E (139 dB at the ear); SureFire SOCOM RC2 at the shooter's ear, 10.3" barrel, M855 (134.7 dB from 16"); SilencerCo Velos LBP muzzle average, 5.56 NATO, host not stated; SilencerCo Omega 300 muzzle average, 5.56 NATO, host not stated; HUB rear, also sold direct thread; HUXWRX Flow 556K hUXWRX publishes no dB figure; its pitch is less gas back at the shooter.
HUXWRX's QD: the Flow can threads on hand tight and seats on a taper. No collar, no latch.
- On the barrel
- A HUXWRX QD flash hider, brake or mount (the old OSS style) on the barrel threads.
- On the can
- The QD interface built into the back of a Flow can.
- How it locks
- The can threads onto the device by hand until it seats on the taper. There is no collar or latch: the taper's grip, and the twist the exiting gas puts on the can, keep it tight. Unscrew it by hand once it cools, or with a wrench.
- Mount cost and length
- About $90 to $160 a mount, which sits about 1.6" past the barrel shoulder, mostly inside the can.
Why people pick it
- Tool-less and nothing to latch: hand tight and done
- Pairs with flow through cans that cut gas to the face
- A flash hider under the can when it's off
What to know first
- Only HUXWRX cans fit
- Fewer mount choices than the bigger systems
- Flow cans are long and heavy for their sound
Cans on it: HUXWRX Flow 556K; HUXWRX Flow 556 Ti; HUXWRX Flow 762 Ti.
HUXWRX QD mounts for 1/2x28 barrels
1/2x28 fits 5.56, .223, .22 LR and most 9mm.
Ranked by what builders add most, in stock first. One listing per model.
Suppressors on HUXWRX QD
| Can | Length | Weight | Sound | Rifle with it on | Price |
|---|---|---|---|---|---|
| HUXWRX Flow 556K 5.56 NATO Flow-Through Suppressor (FDE) - 2159 | n/a | n/a | n/a | n/a | $946 |
| HUXWRX FLOW 6K 6mm Flow-Through Suppressor (Black) - 2892 | n/a | n/a | n/a | n/a | $932 |
| HUXWRX Ventum 762 Suppressor, Black - 2240 | n/a | n/a | n/a | n/a | $799 |
| Huxwrx FLOW Range 36 Ti Suppressor | n/a | n/a | n/a | n/a | $969 |
| HUXWRK FLOW Range 36 Suppressor, Flat Dark Earth | n/a | n/a | n/a | n/a | $969 |
| HUXWRX FLOW Range 36 Titanium DT Suppressor, FDE - 3728 | n/a | n/a | n/a | n/a | $849 |
| Huxwrx FLOW 762 Ti Rifle Suppressor - FDE | n/a | n/a | n/a | n/a | $1053 |
| HUXWRX Flow 762TI, FDE, Suppressor | n/a | n/a | n/a | n/a | $1299 |
From each listing; n/a means the listing doesn't say. Sound is the maker's figure: a reduction (-30 dB) or a meter reading (134 dB). Rifle with it on: an 11.5" SBR, M4 stock extended.
Ranked by what builders add most, in stock first. One listing per model.
What are the suppressor mount types?
Five quick detach and thread-on systems carry most rifle cans, plus plain direct thread. Each one is a part on the barrel and a matching part on the can.
| System | Maker | On the barrel | On the can | Mount price |
|---|---|---|---|---|
| Direct thread | Open standard | Nothing. The barrel's own muzzle threads, with a thread protector when the can is off. | Female threads in the rear cap, cut to the barrel's pitch, or a direct thread HUB adapter. | None |
| HUB 1.375x24 | Open standard | Whatever the adapter on the can calls for: barrel threads, an ASR mount, a KeyMo mount or a taper mount. | A removable rear cap (the HUB adapter) on 1.375x24 threads. | $60 to $180 |
| ASR | SilencerCo | An ASR flash hider, brake or mount on the barrel threads. | An ASR rear mount (or ASR HUB adapter) with a spring loaded lock ring. | $90 to $150 |
| KeyMo | Dead Air | A KeyMo flash hider, brake or mount on the barrel threads. | A KeyMo rear mount (or KeyMo HUB adapter) with a spring detent ring. | $80 to $140 |
| Fast-Attach | SureFire | A SureFire flash hider (SF3P, SF4P), brake or WarComp on the barrel threads. | A SureFire SOCOM or RC2 rear with a ratcheting lock ring and a release latch. | $110 to $200 |
| HUXWRX QD | HUXWRX | A HUXWRX QD flash hider, brake or mount (the old OSS style) on the barrel threads. | The QD interface built into the back of a Flow can. | $90 to $160 |
Will my suppressor fit another brand's mount?
Almost never. Read across from the can to the mount on your rifle. HUB cans are the exception: swap the rear adapter and the can changes systems.
| Your can | Bare threads | ASR mount | KeyMo mount | Fast-Attach mount | HUXWRX QD mount |
|---|---|---|---|---|---|
| Direct thread can | Fits | No | No | No | No |
| HUB 1.375x24 can | HUB adapter | HUB adapter | HUB adapter | No | No |
| ASR can | No | Fits | No | No | No |
| KeyMo can | No | No | Fits | No | No |
| Fast-Attach can | No | No | No | Fits | No |
| HUXWRX QD can | No | No | No | No | Fits |
That's why the can comes first. Pick it, then put its mount on every rifle it will ride on. A mount is about a tenth the price of a can.
What thread pitch does a suppressor mount need?
The mount threads onto the barrel, so it's cut to the barrel's pitch: 1/2x28 on 5.56, .223 and .22 LR, and 5/8x24 on .308, .300 Blackout, 6.5 Creedmoor and other .30 and 6.5mm rifles. The can side is the same for both, so one .30 caliber can rides a 5.56 rifle and a .308 rifle with the right mount on each.
Never put a 5.56 can on a .30 caliber barrel. The bore is too small for the bullet.
How do you install a suppressor mount?
- Clean the barrel threads and the shoulder down to bare metal. Oil and old thread locker keep a mount from seating.
- Thread the mount on by hand to the shoulder. If it has a flat side or ports, shim it so it lands where it should when tight. Use shims, not a crush washer: a crush washer rarely crushes evenly and can tilt the mount off the bore.
- Take it back off, put a high temperature thread locker such as Rocksett on the threads, and torque it to the maker's spec against the shoulder or shims.
- Let it cure as the thread locker's directions say before you shoot it, then check that the can goes on and comes off cleanly.
- Check your zero with the can on. Most rifles move a little.
Why do QD mounts use a taper?
Threads hold a can on; they don't center it well. Every quick detach mount here has a cone just behind the lock that the can pulls down onto. The cone puts the can square to the bore every time it goes on, and it seals, so carbon stays out of the threads and the can comes off after a long string. Turn on the cutaway above to see it.
Direct thread cans skip the cone and seat on the barrel shoulder instead, which is why a clean, square shoulder matters more on them.
Frequently Asked Questions
Is HUXWRX the same as OSS?
HUXWRX is the company that came out of OSS. Its QD mounts carry the same flow through idea, but check the listing before mixing old OSS parts with current HUXWRX ones.
Will a Flow 556K fit a KeyMo or ASR mount?
No. A HUXWRX can goes on HUXWRX QD mounts only.
Does a flow through can need a different mount?
It needs its own maker's mount, like every QD can. The flow through part is inside the can. It cuts the gas blown back at the shooter, so the mount doesn't change because of it.
What are the different suppressor mount types?
Five systems carry most rifle cans: SilencerCo ASR, Dead Air KeyMo, SureFire Fast-Attach and HUXWRX QD, which are quick detach, and HUB, a 1.375x24 thread on the back of the can that takes a swappable adapter. The sixth way is direct thread, where the can screws straight onto the barrel's muzzle threads.
Can I put any suppressor on any mount?
No. Each quick detach can only seats on its own maker's mount: a KeyMo can won't go on an ASR flash hider, and a SureFire can won't go on a KeyMo one. A HUB can is the way around it, because you swap the rear adapter to ASR, KeyMo or direct thread.
What is the best suppressor mount system?
There isn't one best mount, because the can decides it. Pick the can for its sound, weight and back pressure, then run its maker's mount on every rifle it will ride on. If you want to keep your options open, a HUB can lets you change systems later for the price of an adapter.
Should I use a crush washer or shims on a suppressor mount?
Shims. A crush washer rarely crushes evenly, so it can leave the mount a hair off the bore, and the can follows the mount. Every major can maker says to seat a mount against the barrel shoulder or a shim, with a high temperature thread locker such as Rocksett.
Do suppressor mounts have to match my barrel's thread pitch?
Yes, the mount threads onto the barrel, so buy it in the barrel's pitch: 1/2x28 on 5.56 and .22 LR, 5/8x24 on .308, .300 Blackout and 6.5 Creedmoor. The can side doesn't change, so one .30 can runs on both with the right mount on each rifle.
Does a QD mount hurt accuracy?
Not when it's installed right. The taper centers the can the same way every time, so most rifles return to the same point of impact with the can on. Expect that point to differ from the bare muzzle, and check your zero with the can on.
Do I need a flash hider to run a suppressor?
Only on a quick detach system, where the flash hider or brake is the mount. A direct thread can goes on the bare barrel threads and needs no device at all.
Cite this tool: GunPartPicker, “HUXWRX QD Mount: How the Flow 556K Goes On”, https://gunpartpicker.net/tools/suppressor-mounts/huxwrx-qd. Data from the GunPartPicker catalog and real community builds, prices checked October 28, 2026. Free to cite with attribution.
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