The Otter Creek Labs Hydrogen-K 7.62 is the shortest member of the Hydrogen series: a grade 5 titanium, tubeless rifle suppressor made for PRS shooters and hunters who count every ounce. At 5" and 6.7 oz (no mount) it adds very little to a match rifle or a mountain rig, and OCL measured 142 dB on a 16-inch 308 with it fitted.
The distinctive machined exterior is weight reduction, not decoration. Removing the material that does nothing leaves about 10% more surface area, so the can sheds heat and cools faster. Every Hydrogen has the universal 1.375x24 rear thread and ships with a 5/8x24 direct-thread adapter, so it works out of the box and takes any HUB mount later. This is the 7.62 bore version. Made in London, Kentucky, with a lifetime warranty.
Why it stands out
- 6.7 oz grade 5 titanium, tubeless construction
- 5" long, 1.625" diameter
- Weight-reducing exterior sheds heat faster
- Limited full-auto rating (keep it under 800 F)
- 1.375x24 HUB rear thread, 5/8x24 direct-thread adapter included
- Lifetime warranty
Specifications
| Caliber | 30 cal / 7.62mm (308, 300 BLK, 300 Win Mag, 300 PRC, 6.5mm, 6mm and 5.56 hosts too) |
|---|---|
| Length | 5" (no mount) |
| Diameter | 1.625" |
| Weight | 6.7 oz (no mount) |
| Material | Grade 5 titanium |
| Mount | 5/8x24 direct thread (included); 1.375x24 HUB rear thread |
| Finish | Black Cerakote |
| Sound (16" 308) | 142 dB |
| Part number | HYDK762 |
| UPC | 664533654095 |
In the box
- Suppressor
- 5/8x24 direct-thread adapter
- Tube clamp
- Instruction and spec pamphlet, stickers
Barrel length minimums
24" for 300 Norma and 300 RUM; 22" for 300 PRC; 20" for 300 Win Mag; 18" for 6.5 PRC, SAUM and WSM cartridges; 14.5" for 308, 6.5 Creedmoor, 260 and 243; 11.5" for 5.56, 6.5 Grendel, 6 ARC and 7.62x39; 7" for supersonic 300 BLK; 5" for subsonic 300 BLK. Heat is the limit on full auto: stay under 800 F and it is covered.
Buying a suppressor from Guns 2 Ammo
Suppressors are NFA items and are serial-number tracked. Order online or in store, then complete your transfer at our Mesa shop, either as a registered eForm 4 or same day on a Form 4473. Buy it from us and there is no transfer fee. We explain both options, fees and timelines on our NFA & Class III page.
Outside Arizona? We can ship to your local SOT dealer to complete the transfer. Not available in CA, DC, DE, HI, IL, MA, NJ, NY or RI.
Questions? Call (602) 715-2677.
| Manufacturer | Otter Creek Labs |
| Model | Hydrogen-K |
| Caliber | 30 Cal / 7.62mm |
| Type | Silencer |
| Finish | Black Cerakote |
| Material | Titanium |
| Size/Length | 5" |
| Item Weight | 6.7 oz |
| Diameter | 1.625" |
| Mount Type | 5/8x24 Direct Thread / 1.375x24 Universal |