The Faxon Harmonix ION 5.56 Suppressor in Titanium is a lightweight rifle can from Faxon Firearms rated for 5.56 caliber (Faxon part no. FF-SIL-R-3DPC-556-02). Faxon builds it from Grade 5 titanium. It weighs 8.4 ounces without a mount, measures 6.75 inches long and carries a high-temperature ceramic coating. The body is HUB mount compatible, and Faxon packs a 1/2×28 direct thread HUB adapter in the box. It is a practical match for a 5.56 AR-15 that you want to keep light at the front end.

Key Specifications

• The caliber rating is 5.56 caliber, as Faxon lists it for this model.
• Length is 6.75 inches, the same compact body across the Harmonix line.
• Weight is 8.4 ounces with no mount fitted, light for a centerfire rifle can.
• The material is Grade 5 titanium, chosen for strength at low weight.
• The finish is a high-temperature ceramic coating for heat and wear resistance.
• Maximum body diameter is 1.675 inches, with 1.5-inch wrench flats for installation.
• Faxon gives it an 800-degree Fahrenheit thermal limit: short bursts are fine, but it is not for sustained full-auto fire.

Frequently Asked Questions

How much sound does the ION 5.56 cut? Faxon reports 31.3 dB on a 16-inch 5.56 and 29.0 dB on a 10.5-inch 5.56 with direct thread, and 25.6 dB with the Plan B MuzzLok flash hider, measured 1 meter left of the muzzle against a bare muzzle.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

How does the ION differ from the Sentry? The ION is Grade 5 titanium at 8.4 ounces with an 800-degree thermal limit, while the Sentry is Haynes 282 at 15.7 ounces and full-auto rated.

Buy the Faxon Harmonix ION 5.56 Suppressor, Titanium

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through Faxon Firearms‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.