The Faxon Harmonix Sentry 5.56 Haynes 282 Rifle Suppressor is a hard-use can from Faxon Firearms rated for 5.56 caliber (Faxon part no. FF-SIL-R-3DPC-556-01). Faxon builds it from Haynes 282 superalloy, and it weighs 15.7 ounces without a mount. It measures 6.75 inches long and carries a high-temperature ceramic coating. The body is HUB mount compatible, and a 1/2×28 direct thread HUB adapter is packed in the box. Reach for it on a duty-style or high-round-count AR-15 that needs a can built for heat.

Key Specifications

• The caliber rating is 5.56 caliber, as Faxon lists it for this model.
• Length is 6.75 inches, a compact body for the rating.
• Weight is 15.7 ounces with no mount fitted, the cost of a superalloy build.
• The material is Haynes 282 superalloy, a nickel-based alloy built for extreme heat.
• 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 lists it as full-auto rated with no semi-auto barrel length restrictions.

Frequently Asked Questions

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.

Is the Sentry 5.56 full-auto rated? Yes. Faxon lists it as full-auto rated, with no semi-auto barrel length restrictions.

How much sound does it cut on a 5.56? 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, measured 1 meter left of the muzzle against a bare muzzle.

Buy the Faxon Harmonix Sentry 5.56 Haynes 282 Rifle Suppressor

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.