Faxon FirearmsHARMONIX Sentry 5.56
5.56mm / .223 suppressor · HUB 1.375x24 interface · specs and compatibility from the manufacturer
Notable features
- HUB Compatible
- No Barrel Restrictions
- Haynes 282
- Full-Auto Rated
length
6.75″
weight
15.7oz
MSRP
$1,099
length
6.75″
weight
15.7oz
calibers
5.56
material
Haynes 282
interface
HUB 1.375x24
MSRP
$1,099
- Overall length
- 6.75″
- Diameter
- 1.68″
- Weight
- 15.7 oz
- Material
- Haynes 282 Superalloy
- Max caliber
- 5.56mm
- Base interface
- HUB 1.375x24
- Front cap
- Fixed
- Full-auto rated
- Yes
- Barrel restriction
- None (manufacturer stated)
- MSRP
- $1,099
- Class
- 5.56mm / .223
- n
- 292
- Range
- $199–$1,955
- Median
- $899
Pricier than most 5.56mm / .223 suppressors
MSRP compared against the 292 5.56mm / .223 suppressors in the catalog that publish one. Quartile basis; a value inside the middle half carries no note.
Prices are manufacturer's suggested retail (MSRP). What you pay may differ.
- Base interface
- HUB 1.375x24
- Front cap
- Fixed
The HUB 1.375x24 is an open standard: 415 mounts and 818 muzzle devices in our catalog fit this suppressor, including Faxon Firearms Direct Thread HUB Adapter (1/2x28), AAC 51T S.T.A.M.P. Mount and AB Suppressor AB Raptor Adapter. You aren't locked into one manufacturer's parts.
Which ones fit your barrel and host?
Check in the BuilderManufacturer claim
- At the 2025 Thunderbeast Silencer Summit — testing independently conducted by Thunder Beast Arms — the HARMONIX ranked #1 of 22 suppressors at the Shooter's Ear in 9mm in both dB and peak pressure and #2 in dB(A); in 5.56 it placed #5 of 86 at Muzzle Right. All tiers share the same baffle geometry, so the sound results apply across the line.
- Uses the Faxon HUB mount interface and ships with a Direct Thread HUB Adapter (1/2x28 for 5.56, 5/8x24 for .30 and .36 Cal); pair with a MuzzLok Plan B compatible muzzle device for quick-detach.
- 6.75″ long and 1.675″ max diameter; full-auto rated across all calibers with no minimum barrel length restriction on semi-auto or bolt-action hosts.
- Made in the USA by Faxon Firearms, an ISO 9001:2015 certified manufacturer headquartered in Greater Cincinnati, OH.
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- Every component of the Sentry — body, baffles, and end cap — is 3D-printed Haynes 282 nickel superalloy, the most durable tier at 15.7 oz.
- The all-Haynes-282 Sentry ($1,099) is built for belt-fed platforms, sustained automatic fire, and magnum cartridges at institutional round counts where absolute longevity matters more than weight.
- The 5.56 bore is the tightest option and delivers the best 5.56 suppression and least gas blowback for dedicated AR-15 hosts (5.56 NATO, .223 Rem, .224 Valkyrie, .22 Nosler).
- Ships with a 1/2x28 Direct Thread HUB Adapter.