Otter Creek Hydrogen K

Otter Creek Labs Hydrogen K - Compact 7.62 Suppression

The Otter Creek Labs Hydrogen K is a 5-inch, 6.7-ounce titanium suppressor purpose-built for PRS competitors and hunters who refuse to compromise on mobility. Its tubeless Grade 5 titanium construction strips away every unnecessary gram while delivering 10% more surface area than traditional designs, meaning faster cooling between strings of fire. Built on the universal 1.375x24 HUB mounting standard, the Hydrogen K works with the mounts you already own. KeyMo, ASR, Plan-B, Xeno, Dual-Lok, and other HUB-compatible systems attach directly with no proprietary hardware required. A 5/8x24 direct thread adapter comes in the box so you are ready to shoot on day one.

The Hydrogen K is the shortest option in Otter Creek's three-length Hydrogen series, optimized for shooters who prioritize minimal added length and weight over maximum sound reduction. Need more suppression? Step up to the Hydrogen S or Hydrogen L. All three share the same construction, mounting system, and titanium durability. Rated for calibers up to 300 Norma Magnum with limited full-auto capability (must remain below 800 degrees Fahrenheit). Check the minimum barrel length chart below to confirm compatibility with your build.

Why Buy the Otter Creek Labs Hydrogen K 7.62 Suppressor?

Featherweight titanium build. At just 6.7 ounces and 5 inches, the Hydrogen K adds suppression to your rifle without throwing off the balance you have dialed in. 

Faster cooling between shots. The tubeless baffle design creates 10% more surface area than traditional suppressors, shedding heat faster so you can stay on the clock during competition strings or follow-up shots in the field.

Universal HUB compatibility. The 1.375x24 HUB mount standard means no new hardware. Run it on KeyMo, ASR, Plan-B, Xeno, Dual-Lok, or any other HUB-compatible system you already have in your safe.

Ready to shoot out of the box. A 5/8x24 direct thread adapter is included, so there is nothing extra to buy before your first range trip.

Magnum rated. Handles calibers up to 300 Norma Magnum with limited full-auto support, giving you versatility across bolt guns and semi-auto platforms alike.

Features

• Caliber: 7.62 bore (rated up to 300 Norma Magnum)
• Length: 5" (without mount)
• Diameter: 1.625"
• Weight: 6.7 oz (without mount)
• Material: Grade 5 Titanium, tubeless construction
• Mount: 1.375x24 HUB threads (5/8x24 direct thread adapter included)
• Full-Auto Rated: Limited (must remain below 800 degrees Fahrenheit)

Minimum Barrel Lengths

• 24" : 300 Norma Mag, 300 RUM
• 22" : 300 PRC
• 20" : 300 Win Mag
• 18" : 6.5 PRC, 6.5 SAUM, WSM cartridges
• 14.5" : .308 Win, 6.5 Creedmoor, .260 Rem, .243 Win
• 11.5" : 5.56/.223, 6.5 Grendel, 6mm ARC, 7.62x39
• 7" : 300 Blackout (supersonic)
• 5" : 300 Blackout (subsonic)

What's Included

• Otter Creek Labs Hydrogen K 7.62 suppressor
• 5/8x24 direct thread adapter
• Tube clamp for mount installation
• Otter Creek Labs stickers

Popular Compatible Mounts

• Direct Thread: Dead Air, SilencerCo, Energetic Armament, YHM
• SilencerCo Bravo ASR
• Plan-B by Q (Bravo/Omega)
• Dead Air KeyMo (Bravo/Omega), Xeno
• EA TBAC Adapter
• Griffin A2 Adapter, Plan A, Dual-Lok
• YHM Kurz QD Adapter, Phantom QD Adapter
• Any HUB/Bravo mounting solution

Why Buy Your Otter Creek Labs Suppressor from Capitol Armory?

Capitol Armory is America's largest NFA dealer, and we make buying a suppressor as simple as possible. Our ATF eForm 4 approvals are currently averaging just days, not months. We handle all the paperwork, ship directly to your door, and our NFA experts are available to answer every question along the way.