The Otter Creek Labs Hydrogen-S 6.5 Creedmoor suppressor is the mid-length titanium can in the Hydrogen line, built for 6.5mm precision and hunting rifles (Otter Creek Labs part no. HYDS65). At 7 inches it gives useful internal volume without the length of the Hydrogen-L. Otter Creek Labs cuts weight from the outside of the tube, which adds surface area so the can cools quickly. A 5/8×24 direct thread adapter and a tube clamp come in the box. This listing is the black 6.5mm version.

Key Specifications

• The caliber rating is 6.5 Creedmoor, the 6.5mm bore this version is sized for.
• Length is 7 inches, a mid-length format that balances handling against internal volume.
• The body is titanium, which keeps weight down on a rifle that gets carried.
• The rear thread is 1.375×24, the universal HUB pattern that accepts direct thread and quick-detach mounts.
• A 5/8×24 direct thread adapter is included, so the can can go straight onto a 5/8×24 muzzle.
• A tube clamp is included, which is used when installing a mount.
• The finish is black, which keeps glare down in the field.

Frequently Asked Questions

How long is the Hydrogen-S 6.5mm? It is 7 inches long, a mid-length can that balances handling against internal volume.

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.

What comes with it? Otter Creek Labs includes a 5/8×24 direct thread adapter and a tube clamp with the suppressor.

Buy the Otter Creek Labs Hydrogen-S 6.5 Creedmoor Suppressor, 7-Inch Black

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 Otter Creek Labs‘s suppressors lineup and our Lubbock, Texas team will handle the transfer.