The Faxon CoreSync 5.56 Removable Core Rifle Suppressor is a serviceable 5.56 caliber rifle can from Faxon Firearms (Faxon part no. FF-SIL-R-RCA-556-01). It wraps a 17-4 stainless steel body around a removable Faxon Harmonix 5.56 caliber core in Haynes 282, with a nitride finish. The mount is HUB compatible, and a 1/2×28 direct thread HUB adapter and a 5.56 caliber ported end cap come in the box. Faxon lists it as full-auto rated with no semi-auto barrel restrictions, which makes it a durable choice for an AR-15 that sees heavy use.

Key Specifications

• The caliber rating is 5.56 caliber, as Faxon lists it for this model.
• The tube measures 6.5 inches, or 6.75 inches with the ported end cap installed.
• Weight is 16 ounces, the figure for a steel body with a superalloy core.
• The body is 17-4 stainless steel with a Haynes 282 core, chosen for durability under heat.
• The finish is nitride, a hard surface treatment for wear and corrosion resistance.

Frequently Asked Questions

How much sound does the CoreSync 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.

Buy the Faxon CoreSync 5.56 Removable Core 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.