Head to head

HUXWRX FLOW 556k vs SureFire SOCOM556-RC2

By Cole Harlan, EditorUpdated Nov 5, 2026How we verifyEditorial standards

The biggest cited difference is weight and length: HUXWRX lists the FLOW 556k at 12.9 oz and 5.5 in, and SureFire lists the SOCOM556-RC2 at 17.0 oz and 6.4 in. Both are 5.56-class rifle suppressors with their own proprietary mounts. Figures are copied from each maker’s product page, checked November 5, 2026.

At a glance

Spec (maker label)	HUXWRX FLOW 556k	SureFire SOCOM556-RC2
Calibers (maker wording)	Compatible on 5.56, 17 HMR and 5.7 platforms	5.56 mm (.223 caliber)
Weight	12.9 oz	17.0 oz (482 g)
Length	5.5 in	6.4 in (16.2 cm)
Diameter	1.6 in	1.5 in (3.8 cm)
Length added to weapon	Not yet verified	3.8 in (9.7 cm); varies by adapter
Construction	DMLS-printed 17-4 stainless; Flow-Through and Torque Lock	High-temp alloy and stainless steel
Finish	C-series Cerakote; Black and FDE	DLC and Cerakote
Full-auto rated	Yes	Not yet verified
Mount (maker wording)	Compatible with Muzzle Brake-QD 556 and Flash Hider-QD 556	Fast-Attach
Minimum barrel	Not yet verified	Page says optimized for 10-inch and longer M4/M16 variants
Printed MSRP	$1306, for a kit (one FLOW 556k plus one Flash Hider QD 556 1/2x28)	$1,329, for the SOCOM556-RC2 listing
Source (checked Nov. 5, 2026)	huxwrx.com/flow-556k	surefire.com/socom556-rc2

Like for like: the FLOW price is a kit price that includes a flash hider, and we found no can-only price on the page, so the two MSRPs do not measure the same thing and we draw no price gap. The mounts are different systems (HUXWRX QD vs SureFire Fast-Attach), so neither fits the other’s adapters by default. SureFire’s page also prints an ear sound table for the RC2, measured with M855: 137.74 dB at a 10.3 in barrel, 136.40 dB at 14.5 in and 134.70 dB at 16.0 in. We show it as SureFire’s own figures; HUXWRX’s page prints no equivalent table that we read, so there is nothing to set it against. Prices are what the pages printed on the check date. Suppressors are NFA items; see how to buy a suppressor.

Which to pick (on paper)

If lowest listed weight and length matter: the FLOW 556k, 12.9 oz and 5.5 in against 17.0 oz and 6.4 in.
If the slimmer tube matters: the SOCOM556-RC2 lists 1.5 in; the FLOW 556k lists 1.6 in.
If you already own SureFire Fast-Attach or HUXWRX QD hardware: match the mount system you own.
If you shoot 17 HMR or 5.7 as well: HUXWRX lists the FLOW 556k as compatible on those platforms; SureFire lists the RC2 as 5.56 mm.
If you run a short barrel: SureFire states the RC2 is optimized for 10-inch and longer barrels; check HUXWRX directly for the FLOW.

We have not range-tested these; facts above are from the makers.

Not yet verified

A can-only price for the FLOW 556k.
Full-auto rating for the RC2 and minimum barrel for the FLOW 556k (not read on those pages).
Decibel figures for the FLOW 556k.

Frequently asked questions

Which is lighter, the HUXWRX FLOW 556k or the SureFire SOCOM556-RC2?

HUXWRX lists the FLOW 556k at 12.9 oz. SureFire lists the SOCOM556-RC2 at 17.0 oz (482 g).

Is the FLOW 556k price comparable to the RC2 price?

Not directly. HUXWRX's $1306 is a kit price with one FLOW 556k and one Flash Hider QD 556 1/2x28. SureFire's $1,329 is the SOCOM556-RC2 listing.

What does SureFire print for RC2 sound levels?

SureFire's page lists M855 sound data of 137.74 dB at a 10.3 inch barrel, 136.40 dB at 14.5 inches and 134.70 dB at 16.0 inches.

HUXWRX FLOW 556k vs SureFire SOCOM556-RC2

At a glance

Which to pick (on paper)

Not yet verified

Frequently asked questions

Sources

Keep exploring

At a glance

Which to pick (on paper)

Not yet verified

Frequently asked questions

Sources

Keep exploring

The Gun Release Report