Otter Creek Labs Polonium 30 - Silencer 5/8X24 7.62 Fde

The Otter Creek Labs Polonium 30 is a multi-caliber suppressor built for shooters who want one can that works across an entire gun safe. Chambered in 5/8×24 thread and optimized for 7.62 rifles, this 30-caliber silencer delivers solid performance on everything from .308 Winchester to 300 Blackout, 5.56, and magnum cartridges—without breaking the bank. Otter Creek Labs doesn't sugarcoat the engineering trade-offs: a 30-caliber bore inherently gives up some performance compared to a dedicated 5.56 suppressor, and they're transparent about that. What you get instead is a versatile, durable suppressor that handles caliber-switching duties with respectable sound and flash reduction across platforms.

The Polonium 30's design philosophy centers on doing more with less. CNC-welded from H900 heat-treated 17-4 stainless steel in a tubeless construction, the can uses aggressive external weight reduction—removing material where it doesn't matter—to shed 13.5 ounces without sacrificing strength. That design choice yields 10% more surface area than conventional suppressors, which translates to faster cooling and heat shedding when running strings downrange or cycling between calibers. The integrated flash hider—both internal and external—suppresses muzzle signature and flash effectively, even under night vision, giving you a working suppressor that genuinely performs in the field.

The 5/8×24 direct-thread adapter is included, and the universal 1.375″×24 rear threads mean you can swap mounting systems to fit your rifle collection without buying multiple cans. Whether you're a budget-conscious shooter running a mixed-caliber battery or someone who wants proven, straightforward suppressor tech, the Polonium 30 delivers the kind of honest engineering Otter Creek Labs has built its reputation on: good, durable, affordable gear that works.

Key Features

• Multi-caliber design handles .308, 300 Blackout, 5.56, 300 RUM, and 300 Norma Magnum
• H900 heat-treated 17-4 stainless steel with CNC-welded, tubeless construction
• Aggressive weight reduction design—10% more surface area, faster heat dissipation
• Integrated internal and external flash hider for signature reduction with night vision
• Universal 1.375″×24 rear threads for modular mounting system compatibility
• 5/8×24 direct-thread adapter included
• Rated for full-auto and short-barrel rifles

Specifications

Frequently Asked Questions

What calibers does the Polonium 30 work with?

The 30-caliber bore handles .308 Winchester, 300 Blackout, 5.56 NATO, 300 RUM, 300 Norma Magnum, and other cartridges in that range. It's rated for full-auto and short-barrel rifles.

What's the difference between the Polonium 30 and a dedicated 5.56 suppressor?

A 30-caliber bore trades some 5.56 performance for versatility across multiple calibers. If you're running only 5.56, Otter Creek Labs' dedicated 5.56 models (Polonium or Polonium-K) will outperform the Polonium 30 on that platform. The Polonium 30 is built for shooters who need one can across a mixed gun collection.

What mounting options does it support?

The suppressor has universal 1.375″×24 rear threads, so you can use any mounting system compatible with that standard. A 5/8″×24 direct-thread adapter is included in the box, and a tube clamp is provided for installing and changing mounts.

What's included with the suppressor?

The box contains the Polonium 30 suppressor, a 5/8″×24 direct-thread adapter, a tube clamp for mount installation, instruction pamphlet, and stickers.