FAXON HARMONIX® SENTRY .36 CAL RIFLE SUPPRESSOR - HAYNES 282
Faxon
$1,099.00
⚠️ Suppressor Transfer Acknowledgment
Federal law requires all suppressor purchases to be transferred to a licensed SOT holder.
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Faxon
FAXON HARMONIX® SENTRY .36 CAL RIFLE SUPPRESSOR - HAYNES 282
Faxon HARMONIX® SENTRY .36 Cal Rifle Suppressor | Haynes 282 | HUB Mount Compatible
Made in the USA Full-Auto Rated Haynes® 282 HUB Mount Compatible Limited Lifetime Warranty Low Backpressure
One can for the calibers that matter. The Faxon HARMONIX® SENTRY .36 Cal Rifle Suppressor is built for shooters who refuse to compromise — running 5.56, .300 BLK, .308 Win, 338 ARC, 8.6 BLK, and 9mm PCC off a single, hard-use suppressor. Constructed from Haynes® 282 superalloy and finished in a high-temp ceramic coating, the SENTRY is full-auto rated, features a low backpressure-focused internal design, and mounts via the industry-standard HUB interface. This is American-made suppressor engineering for the platform you run hard — every day, on every round count.
Add to Cart — $1,099.00Not sure if the SENTRY is the right can for your setup? Browse the full Faxon Suppressor lineup — compare the HARMONIX® ION (titanium, 8 oz) and CORESYNC® Series (fully serviceable, swappable cores) side by side.
Why Choose the SENTRY .36 Cal?
The SENTRY sits at the top of the HARMONIX® line — built from Haynes® 282, a nickel-based superalloy engineered for extreme heat resistance that goes well beyond what conventional stainless steel can handle. That matters when you're running full-auto, stringing fast strings on 300 BLK, or pushing a .308 platform hard. While a lot of cans look the same on paper, the SENTRY is engineered with a low-backpressure geometry that keeps gas moving forward and away from the shooter — a real quality-of-life difference you'll feel at the range.
The HUB-compatible mount system means you're not locked into a proprietary ecosystem. Swap mounts, adapt to new hosts, and expand your setup as your platform list grows. A direct-thread HUB adapter is included in the box.
Key Features
- Made in the USA — Manufactured by Faxon Firearms in Greater Cincinnati, OH (established: 2012)
- Haynes® 282 superalloy construction — extreme heat resistance, superior to stainless for hard-use suppressor applications
- Full-auto rated — built for demanding firing schedules without compromise
- Low backpressure-focused internal design — minimizes gas returned to the shooter and reduces carbon blowback
- HUB mount compatible — broad mounting ecosystem, works with popular HUB-standard mounts and adapters
- High-temp ceramic coating — durable, hard-use exterior finish rated for sustained heat
- Ultrasonic cleanable — maintain performance over thousands of rounds (see note below)
- Faxon Limited Lifetime Warranty — covers manufacturing and material defects
Up to 25.8 dB reduction vs. bare muzzle — tested across 5.56, 300 BLK (sub & super), .308 Win, 338 ARC, 8.6 BLK, and 9mm PCC platforms. See full data in the Performance Results table below.
All dB readings taken at 1 meter left of the muzzle. Direct thread configuration.
Technical Specifications
← Swipe to see full table →
| Specification | Details |
|---|---|
| SKU | FF-SIL-R-3DPC-36-01 |
| UPC | 816341029507 |
| MSRP | $1,099.00 |
| Caliber Rating | .36 Cal and smaller (5.56, .30, .36) |
| Length | 6.75" |
| Weight (no mount) | 15.7 oz |
| Max Body Diameter | 1.675" |
| Wrench Flats | 1.5" |
| Material | Haynes® 282 Superalloy |
| Finish | High-Temp Ceramic Coating |
| Mount Interface | HUB Mount Compatible |
| Full-Auto Rated | Yes |
| Semi-Auto Barrel Length Restrictions | None |
| Serviceable | Ultrasonic cleanable (see note) |
| Warranty | Limited Lifetime |
| Country of Manufacture | USA |
In the Box
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| Item | SKU | Details |
|---|---|---|
| Faxon HARMONIX® SENTRY .36 Cal Rifle Suppressor | FF-SIL-R-3DPC-36-01 | Haynes 282, HUB interface, high-temp ceramic coating |
| Faxon 5/8x24 Stainless Steel Direct Thread to HUB Adapter | FF-MD-SIL-HUB-625-24-01 | 5/8x24 thread pitch — fits .30 cal and .36 cal rifle hosts. Upgrade available: Titanium version (FF-MD-SIL-HUB-625-24-02) — $95 |
Need a different thread pitch? See the full HUB adapter lineup in the mounting section below.
Performance Results — dB Reduction vs. Bare Muzzle
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| Platform | Configuration | Reduction vs. Bare Muzzle |
|---|---|---|
| 16" 5.56 | Direct Thread | 23.6 dB |
| 9" 300 BLK (Supersonic) | Direct Thread | 23.8 dB |
| 9" 300 BLK (Subsonic) | Direct Thread | 24.1 dB |
| 18" .308 Win | Direct Thread | 20.5 dB |
| 13.9" .308 Win | Direct Thread | 22.4 dB |
| 12.5" 338 ARC (Subsonic) | Direct Thread | 25.2 dB |
| 12" 8.6 BLK (Subsonic) | Direct Thread | 20.6 dB |
| 10.5" 9mm PCC (No Booster, Supersonic) | Direct Thread | 25.8 dB |
All dB readings taken 1 meter left of the muzzle.
HARMONIX® Suppressor Comparison — Find Your Fit
The HARMONIX® line includes three distinct platforms. Here's how they stack up:
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| Feature | SENTRY (Haynes 282) — This Model | ION (Titanium) | CORESYNC® Series |
|---|---|---|---|
| Material | Haynes® 282 Superalloy | Grade 5 Titanium | 3D-printed Haynes 282® core + 17-4 SS body |
| Weight (approx.) | ~15.7 oz | ~8 oz | Varies by config |
| Full-Auto Rated | ✔ Yes | ✔ Yes | ✔ Yes |
| HUB Mount Compatible | ✔ Yes | ✔ Yes | ✔ Yes |
| Fully Serviceable | Ultrasonic cleanable | Ultrasonic cleanable | ✔ Fully serviceable |
| Swappable Caliber Cores | — | — | ✔ Yes (MULTICAL Kit) |
| .36 Cal MSRP | $1,099 | $975 | $975 |
Complete Your Suppressor Setup
The SENTRY ships with a 5/8x24 stainless HUB adapter — perfect for most .30 and .36 cal rifle hosts. If your host barrel has a different thread pitch, or you want to run a Plan B-compatible mount system, here's everything on the current Faxon price list that pairs with this suppressor.
Direct Thread to HUB Adapters
Swap in the right thread pitch for your host barrel. Stainless ($65) or titanium ($95) in every common rifle thread pattern.
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| Thread / Description | SKU — Stainless ($65) | SKU — Titanium ($95) |
|---|---|---|
| 5/8x24 — .30 cal & .36 cal rifles (included with this suppressor) | FF-MD-SIL-HUB-625-24-01 | FF-MD-SIL-HUB-625-24-02 |
| 1/2x28 — 5.56 / .223 / 9mm rifles | FF-MD-SIL-HUB-5-28-01 | FF-MD-SIL-HUB-5-28-02 |
| 11/16x24 — large bore / .45 ACP hosts | FF-MD-SIL-HUB-6875-24-01 | FF-MD-SIL-HUB-6875-24-02 |
| M18x1.5 — European / SCAR / HK thread pitch | FF-MD-SIL-HUB-M18-01 | FF-MD-SIL-HUB-M18-02 |
Plan B to HUB Adapters
Already running a Plan B-compatible muzzle device? Drop a Plan B to HUB adapter between your existing device and the SENTRY — no re-timing, no new muzzle device required. Available in standard and extended lengths.
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| Description | SKU — Stainless ($65) | SKU — Titanium ($95) |
|---|---|---|
| Plan B to HUB Adapter — Standard | FF-MD-SIL-HUB-PB-01 | FF-MD-SIL-HUB-PB-02 |
| Extended Plan B to HUB Adapter — extra standoff for longer hosts | FF-MD-SIL-HUB-PB-03 | FF-MD-SIL-HUB-PB-04 |
MuzzLok® Plan B Compatible Muzzle Devices — $85 each
No Plan B mount yet? Start here. Faxon's MuzzLok® line uses a cam-lock mechanism — no shims, no crush washers, no timing headaches. All Plan B compatible devices below work with the Plan B to HUB adapters above to give you a full quick-detach suppressor mounting solution.
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| Device Type | Thread / Bore | SKU |
|---|---|---|
| Flash Hider (Standard) | 1/2x28 — .250" bore (5.56 / 9mm hosts) | FF-MD-PB-FH-01 |
| Flash Hider (Standard) | 5/8x24 — .375" bore (.30/.36 cal hosts) | FF-MD-PB-FH-02 |
| Flash Hider (Standard) | 1/2x28 — 9mm bore | FF-MD-PB-FH-03 |
| Flash Hider (Standard) | M18x1.5 — .338" bore | FF-MD-PB-FH-04 |
| Muzzle Brake (Standard) | 1/2x28 — .250" bore | FF-MD-PB-BRAKE-01 |
| Muzzle Brake (Standard) | 5/8x24 — .375" bore | FF-MD-PB-BRAKE-02 |
| Muzzle Brake (Standard) | 1/2x28 — 9mm bore | FF-MD-PB-BRAKE-03 |
| Muzzle Brake (Standard) | M18x1.5 — .338" bore | FF-MD-PB-BRAKE-04 |
| Mini Flash Hider (Compact profile) | 1/2x28 — .250" bore | FF-MD-PB-KFH-01 |
| Mini Flash Hider (Compact profile) | 5/8x24 — .338" bore | FF-MD-PB-KFH-02 |
| Mini Flash Hider (Compact profile) | 1/2x28 — 9mm bore | FF-MD-PB-KFH-03 |
| Mini Flash Hider (Compact profile) | M18x1.5 — .338" bore | FF-MD-PB-KFH-04 |
| Mini 3-Prong Flash Hider | 1/2x28 — .250" bore | FF-MD-PB-K3P-01 |
| Mini 3-Prong Flash Hider | 5/8x24 — .338" bore | FF-MD-PB-K3P-02 |
| Mini 3-Prong Flash Hider | 1/2x28 — 9mm bore | FF-MD-PB-K3P-03 |
| Mini 3-Prong Flash Hider | M18x1.5 — .338" bore | FF-MD-PB-K3P-04 |
| Mini Muzzle Brake (Compact profile) | 1/2x28 — .250" bore | FF-MD-PB-KBRAKE-01 |
| Mini Muzzle Brake (Compact profile) | 5/8x24 — .338" bore | FF-MD-PB-KBRAKE-02 |
| Mini Muzzle Brake (Compact profile) | 1/2x28 — 9mm bore | FF-MD-PB-KBRAKE-03 |
| Mini Muzzle Brake (Compact profile) | M18x1.5 — .338" bore | FF-MD-PB-KBRAKE-04 |
| Minimalist Mount (bare Plan B nub) | 1/2x28 — .250" bore | FF-MD-PB-NUB-01 |
| Minimalist Mount (bare Plan B nub) | 5/8x24 — .338" bore | FF-MD-PB-NUB-02 |
| Minimalist Mount (bare Plan B nub) | M18x1.5 — .338" bore | FF-MD-PB-NUB-04 |
| Rowdy Pineapple Linear Compensator | Multi — Plan B compatible | FF-MD-PB-VLC-01 |
Also Recommended
Running this suppressor on an AR platform? A Faxon Adjustable Gas Block lets you tune your gas system for both suppressed and unsuppressed use — especially valuable on shorter-barreled or carbine-gas hosts where suppressor backpressure can cause over-gassing.
Warranty
All Faxon Firearms suppressors are backed by our Limited Lifetime Warranty, covering the original purchaser against manufacturing and material defects. If something is wrong because of how we made it, we make it right. Full details at: https://faxonfirearms.com/warranty-privacy-terms/
Cleaning & Maintenance
The HARMONIX® SENTRY can be cleaned via ultrasonic cleaner. Use caution: improper ultrasonic cleaning can damage the suppressor's ceramic finish. If you have questions about cleaning your HARMONIX® suppressor, contact us at customerservice@faxonfirearms.com before proceeding. For shooters who prefer a fully serviceable platform, consider the CORESYNC® .36 Cal.
Frequently Asked Questions
What calibers can I run through the SENTRY .36 cal?
The SENTRY is rated for .36 caliber and smaller applications. Our test data covers 5.56, 300 BLK (subsonic and supersonic), .308 Win, 338 ARC (subsonic), 8.6 BLK (subsonic), and 9mm PCC (no booster, supersonic). The .36 caliber rating makes it a genuinely versatile one-can solution across multiple popular rifle platforms.
What is Haynes® 282 and why does it matter for a suppressor?
Haynes® 282 is a nickel-based superalloy originally developed for demanding aerospace and turbine applications. It offers exceptional high-temperature strength, oxidation resistance, and fatigue resistance — properties that directly benefit a suppressor running sustained fire. It performs beyond what standard stainless steel grades can handle in a full-auto-rated environment, which is why Faxon chose it for the SENTRY.
Is the SENTRY compatible with HUB mounts?
Yes. The SENTRY uses the industry-standard HUB-compatible mount interface, giving you broad compatibility with popular mounting ecosystems — including popular aftermarket HUB mounts and adapters. A direct-thread HUB adapter is included in the box. Browse Faxon HUB suppressor mounts for additional mounting options.
Is the HARMONIX® SENTRY full-auto rated?
Yes. The SENTRY is full-auto rated and built from Haynes® 282, a high-temperature superalloy chosen specifically for its ability to withstand the heat load of demanding, sustained firing schedules. There are no semi-auto barrel length restrictions either.
How does the SENTRY compare to the HARMONIX® ION?
The SENTRY uses Haynes® 282 (a heavy-duty nickel superalloy) while the ION uses Grade 5 Titanium. The ION weighs approximately 8 oz — roughly half the SENTRY's 15.7 oz — making it the ultralight choice. The SENTRY's heavier construction offers additional thermal mass and durability for sustained high-rate fire. Both are HUB-compatible, full-auto rated, and covered by Faxon's Limited Lifetime Warranty. Price difference: SENTRY is $1,099 vs. ION's $975 for .36 cal.
What's the difference between the SENTRY and the CORESYNC®?
The CORESYNC® features a 3D-printed Haynes® 282 core paired with a 17-4 stainless steel outer body, and is fully serviceable — you can disassemble and clean the core directly. It also comes in a MULTICAL Kit with swappable caliber-marked cores (5.56, .30, .36) for one serialized body that covers three calibers. The SENTRY is a single-piece design that's ultrasonic cleanable. If full serviceability and multi-caliber flexibility are priorities, look at the CORESYNC® .36 Cal.
Should I use an adjustable gas block with the SENTRY?
It depends on your host rifle. Suppressors increase backpressure in the gas system, which can cause over-gassing on many AR platforms — especially with carbine-length gas systems or shorter barrels. A Faxon Adjustable Gas Block lets you tune the gas system for suppressed and unsuppressed use, improving reliability, reducing bolt velocity, and extending component life. Highly recommended for suppressed ARs.
Where is the HARMONIX® SENTRY manufactured?
The HARMONIX® SENTRY is designed and manufactured in the United States by Faxon Firearms. Faxon has been precision manufacturing firearms components in Fairfield, OH (Greater Cincinnati) since 2012, applying the same process controls and quality standards to suppressors that we've always applied to barrels.
⚠ NFA Item — Federal Regulations Apply: Suppressors are regulated under the National Firearms Act. As of January 1, 2026, the $200 transfer tax has been eliminated — no tax stamp fee is required at the time of this writing. However, ATF Form 4, a background check, fingerprints, and photographs are still required. The suppressor must remain with your FFL/SOT dealer until your Form 4 is approved. Transfer times vary and may be longer due to increased demand. NFA regulations are subject to change — always verify current federal, state, and local requirements before purchasing.
Some states restrict or prohibit suppressor ownership entirely. It is the buyer's responsibility to know and comply with all applicable laws.
Trademark & Compatibility Notice: HARMONIX® and CORESYNC® are registered trademarks of Faxon Firearms LLC. Haynes® and Haynes® 282 are registered trademarks of Haynes International, Inc. All other third-party trademarks referenced are the property of their respective owners. References to compatibility are for descriptive purposes only and do not imply endorsement. Q® and related marks are property of Q, LLC. HUXWRX Flow-Through® is a registered trademark of its respective owner.
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All Faxon Firearms suppressors are backed by our Limited Lifetime Warranty.
Full details: https://faxonfirearms.com/warranty-privacy-terms/
- ffl-firearm:
- 1
- Caliber:
- .36
- Material:
- Haynes 282
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