The Otter Creek Labs Hydrogen L 7.62mm suppressor is the .30-caliber long version of the Hydrogen line, rated for .308 Winchester and 7.62 NATO (Otter Creek Labs part no. HYDL762). Its 9-inch length gives it more internal volume than a short can. It fits a 5/8×24 thread, the standard pitch on .308-class barrels. Precision rifle shooters and hunters running .30-caliber bolt guns are who it was built for. For a rifle where length matters less than sound, it is the Hydrogen to choose.

Key Specifications

• The caliber rating is .308 / 7.62 NATO, the .30-caliber cartridges this version is built for.
• Length is 9 inches, the long Hydrogen L format.
• Thread pattern is 5/8×24, the common .308 barrel pitch.
• The model is the Hydrogen L, the long version of the Hydrogen.

Frequently Asked Questions

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.

Which cartridges is the Hydrogen L 7.62mm built for? It is rated for .308 and 7.62 NATO rifles.

Is there a 6.5mm version? Yes. This listing is the 7.62mm model; a 6.5mm Hydrogen L is listed separately.

Buy the Otter Creek Labs Hydrogen L 7.62mm Suppressor, .308

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. Long, .30-caliber and built for the bolt gun, it is the Hydrogen for maximum volume. Order through Otter Creek Labs‘s suppressors lineup and our Lubbock, Texas team will handle the transfer.