The Otter Creek Labs Infinity 556K (brand part no. INF556K) is a 5.56 NATO suppressor 3D-printed from Haynes 282 superalloy, built around Otter Creek Labs’ adjustable end cap system. The end cap can be swapped between low, medium, and high back-pressure options, letting one suppressor run cleanly on everything from a bolt-action rifle to an over-gassed AR or AK. It ships with the medium back-pressure end cap installed.

Key Specifications

• Rated for 5.56 NATO/.223 Remington.
• Machined from Haynes 282 superalloy via 3D printing.
• Mounts via the 1.375×24 HUB quick-detach thread pattern.
• Features an adjustable end cap system with low, medium, and high back-pressure options.
• Ships with the medium back-pressure end cap installed.

Frequently Asked Questions

Is this an NFA item? Yes. As a suppressor, it’s a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

Can I adjust the back pressure? Yes, the Infinity 556K’s end cap can be swapped for low, medium, or high back-pressure options (medium ships installed; low and high are sold separately).

Buy the Otter Creek Labs Infinity 556K Suppressor

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through Otter Creek Labs‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will walk you through the transfer process.