The Griffin HRT-5K AM HUB 5.56 suppressor is a compact, HUB-compatible 5.56 NATO can in Flat Dark Earth, engineered with an ultra-low back pressure design to help reduce gas blowback. Griffin Armament prints the core from its Nickel 625X powder alloy and laser-welds it to a machined rear, and the can runs just 4.5 inches long on a 1.375×24 HUB rear interface. It is built for AR-15 and other gas-operated rifles, and the short length suits compact rifle builds. A HUB mount and muzzle device are not included and must be bought separately.

Key Specifications

• The caliber rating is 5.56 NATO, the cartridge this can is tuned for.
• The rear interface is HUB, 1.375×24, which accepts Griffin HUB mounts and other makers’ HUB mounts.
• Length is 4.5 inches and weight is 11.5 ounces, a short, light package for compact rifles.
• Diameter is 1.5 inches, a size that clears most handguards.
• The color is Flat Dark Earth, a tan shade that suits earth-tone rifle builds.
• The build is Nickel 625X with 17-4 H900 stainless steel, a printed core laser-welded to a machined rear section.

Frequently Asked Questions

Does the HRT-5K AM HUB version come with a mount? No. It ships with a Griffin pouch but without a HUB mount adapter or muzzle device, so you choose the mount and muzzle device separately.

Does it have barrel length restrictions? Griffin lists no minimum barrel length restrictions for compatible rifle calibers, and it rates the can full-auto.

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 Griffin HRT-5K AM HUB 5.56 Suppressor, Flat Dark Earth

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 Griffin Armament‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.