The Otter Creek Labs Infinity 556K Elite Package in Flat Dark Earth is a short, light 5.56 suppressor built for hard-use rifles, taking its design from the full-size Infinity. The body is a Haynes 282 nickel-cobalt superalloy printed by DMLS, a material chosen for the heat of sustained fire. It is rated for 5.56 NATO and 6mm and measures 5.5 inches overall, which keeps SBR and close-quarters builds handy. The rear thread is the HUB 1.375×24 pattern, so you choose the mount that suits your rifle. Otter Creek Labs backs it with a lifetime warranty.

Key Specifications

• The caliber rating is 5.56 NATO and 6mm, the cartridges the Infinity 556K is built around.
• Overall length is 5.5 inches, short enough for SBR and close-quarters builds.
• Weight is 14.5 ounces without a mount, light for a superalloy rifle can.
• The body is DMLS-printed Haynes 282 nickel-cobalt superalloy, chosen for high-temperature use.
• The rear thread is HUB 1.375×24, which works with Bravo and many direct-thread and QD mounts.

Frequently Asked Questions

How does the Infinity 556K mount? It uses a 1.375×24 rear thread, the HUB pattern, so you pair it with a compatible direct-thread or quick-detach mount.

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 Otter Creek Labs Infinity 556K Suppressor, FDE, Elite Package

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. Pick the Elite Package when you want the Infinity 556K in a Flat Dark Earth finish for a tan build. Order through Otter Creek Labs‘s suppressors lineup and our Lubbock, Texas team will handle the transfer.