The Energetic Armament Ferox 5.56mm suppressor in black nitride (Energetic Armament part no. EA13) is an ultralight heat-treated stainless can optimized for short and mid-length 5.56mm barrels. Its radial gas bleed design lowers backpressure while keeping weight to 12.5 ounces, and it ships with a removable 1/2-28 direct-thread adapter for a standard AR-15 muzzle. The removable flash hider end cap carries functional flash-reducing tines, which matters on a carbine. It also fits any 1.375×24 HUB or Bravo-style quick-disconnect mount, including the Energetic Armament Project E.

Key Specifications

• The rating is 5.56mm/.223 up to 6mm, with Energetic Armament listing 5.56×45 NATO, .223 Remington, 5.45×39, 5.7×28, .224 Valkyrie and 6mm ARC.
• The length is 5.9 inches in the direct-thread configuration, short enough for a carbine.
• The maximum diameter is 1.63 inches, a compact envelope for the internal volume.
• The assembled weight is 12.5 ounces with the flash hider end cap, light for a 5.56mm can.
• The core is welded 17-4 stainless steel heat treated to H900, built to be strong without extra weight.
• The finish is black nitride, a hard, low-glare surface treatment.
• The included mount is a removable 1/2-28 direct-thread adapter, which fits standard 5.56mm barrel threads.
• The mounting interface is 1.375×24 HUB and Bravo-style compatible, so you can swap to a quick-disconnect mount.
• The end cap is a removable flash hider with flash-reducing tines, which cuts flash at the muzzle.
• Energetic Armament lists no barrel length restrictions and a full-auto rating with 5.56 NATO and .223 Remington, so the can suits hard use.

Frequently Asked Questions

What thread does the Ferox use? It ships with a removable 1/2-28 right-hand direct-thread adapter, and the suppressor body accepts 1.375×24 HUB or Bravo-style mounts.

What is included with it? The box holds the Ferox with the 1/2-28 direct-thread adapter, a wrench multi-tool, a VOX Blox vise block, a packet of anti-seize, an instruction manual and decals.

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 Energetic Armament Ferox 5.56mm Direct Thread Suppressor, Black Nitride

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 Energetic Armament‘s silencers and suppressors lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.