Description
Hang a suppressor on the end of an AR and the first thing you notice is the weight. The Faxon Harmonix ION solves that problem better than just about anything in its class. The entire can is 3D-printed from Grade 5 titanium, which brings it in at a scant 7.84 ounces while keeping the strength and heat resistance you need for real range work. At 6.75 inches long with a 1.675 inch body, it adds serious sound reduction to your rifle without turning it into a pool cue.
Why the Harmonix ION Runs So Quiet
Faxon gave the ION a dedicated 5.56 bore instead of an oversized multi-caliber opening, and that tighter bore means less gas blowing past the bullet and noticeably better suppression than running 5.56 through a .30 cal can. Additive manufacturing lets Faxon build baffle geometry that traditional machining simply can't produce, and the whole Harmonix line was designed around strong sound and flash reduction with low backpressure, so you're not eating a face full of gas on every string. A high-temp ceramic coating in black finishes it off with a clean, non-reflective look that blends into any build.
Mounting the Faxon ION 5.56
The ION is HUB mount compatible, so it plays nice with the huge ecosystem of HUB pattern mounts already on the market. Faxon includes a 1/2×28 direct thread HUB adapter in the box, which covers the standard AR-15 muzzle thread right out of the gate. If you want quick-detach capability down the road, pairing it with a MuzzLok Plan B compatible muzzle device gets you there without buying a different suppressor.
Built in the USA, Backed for Life
Every Harmonix suppressor is made by Faxon in the Cincinnati, Ohio area, the same shop that earned its reputation building match-grade barrels. The ION is full-auto rated, has no barrel length restrictions on semi-auto or bolt guns, and cleans up easily in an ultrasonic cleaner when the time comes. Faxon backs it with a limited lifetime warranty. For lightweight carbines, hunting rigs, or any 5.56 build where ounces matter, this can is tough to beat.
Key Specifications
- Caliber: .223 Rem / 5.56 NATO
- Construction: 3D-Printed Grade 5 Titanium
- Weight: 7.84 oz (without mount)
- Length: 6.75 in
- Diameter: 1.675 in
- Finish: Black High-Temp Ceramic Coating
- Mounting System: HUB Compatible
- Included Adapter Thread: 1/2×28 Direct Thread HUB Adapter
- Full-Auto Rated: Yes
- Barrel Length Restriction: None (semi-auto and bolt action hosts)
- Manufacturer: Faxon Firearms
- Manufacturer Part Number: FFSILR3DPC55602
- UPC: 816341029453
- Made In: USA (Cincinnati, Ohio)
- Warranty: Limited Lifetime
What’s Included
- Faxon Harmonix ION 5.56 Suppressor
- 1/2×28 Direct Thread HUB Adapter
Frequently Asked Questions
How much does the Faxon Harmonix ION 5.56 weigh?
The ION comes in at 7.84 ounces without the mount, making it one of the lightest full-size 5.56 rifle suppressors you can buy. That weight savings comes from the fully 3D-printed Grade 5 titanium construction. On a lightweight carbine or hunting rifle, you barely notice it hanging off the muzzle.
What mounts work with the Harmonix ION?
The ION uses the industry-standard HUB mounting pattern, so it works with the wide range of HUB compatible mounts on the market. Faxon includes a 1/2×28 direct thread HUB adapter in the box, which threads straight onto a standard AR-15 muzzle. If you want quick-detach, pair it with a MuzzLok Plan B compatible muzzle device.
Is the Faxon Harmonix ION full-auto rated?
Yes, Faxon rates the entire Harmonix line for full-auto fire with no minimum barrel length restrictions on semi-auto or bolt action hosts. For high-volume sustained fire, Faxon also offers the Ti-CONEL version with an Inconel blast baffle, but for range days, hunting, competition, and general carbine use, the all-titanium ION handles it all.
Does the 5.56 ION suppress better than a .30 cal can on an AR-15?
It does. The dedicated 5.56 bore is tighter than a .30 caliber opening, which means less gas escapes around the bullet and more sound gets trapped inside the baffles. If your host rifle is an AR-15 or another 5.56 platform, the caliber-specific bore gives you noticeably better suppression than a multi-caliber can.



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