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

The Otter Creek Labs Polonium 30 is a 7.62 rifle suppressor built for shooters who want one can that works across multiple platforms without breaking the bank. This 5/8x24 threaded silencer is engineered as a genuine multi-caliber solution—capable of handling everything from 5.56 and 300 Blackout to .308, .300 RUM, and .300 Norma Magnum. If you're tired of swapping suppressors between rifles or want a single, versatile can for your collection, the Polonium 30 delivers respectable performance across the board.

The design philosophy here is refreshingly honest. Otter Creek Labs acknowledges what every engineer knows: a 30-caliber bore doesn't produce the same sound reduction on 5.56 as a dedicated 5.56 suppressor would. But the trade-off is real utility. You get a suppressor that performs well enough on all your rifles, weighs just 13.5 ounces, and sheds heat quickly thanks to aggressive external fluting that increases surface area while cutting unnecessary weight. The integrated flash hider—both internal and external—provides solid signature reduction, particularly valuable if you're running night vision on the range or in the field.

Construction is H900 heat-treated 17-4 stainless steel in a CNC-welded tubeless design, the same robust platform that earned the original Polonium its reputation for durability. The universal 1.375"-24 rear threads mean you're free to choose your own mounting system—direct thread, KeyMo, Obsidian, whatever fits your rifle. The 5/8x24 direct-thread adapter and tube clamp for mount changes are included in the box.

Key Features

• Multi-caliber compatibility: 5.56, .300 Blackout, .308, .300 RUM, .300 Norma Magnum, and more
• Lightweight design (13.5 oz) with 10% more surface area for faster heat dissipation
• Integrated flash hider for superior flash and signature reduction with night vision
• H900 heat-treated 17-4 stainless steel construction, CNC welded and tubeless
• Universal 1.375\"-24 rear threads for mounting system flexibility
• Includes 5/8x24 direct-thread adapter and tube clamp

Specifications

Frequently Asked Questions

Can the Polonium 30 really work on all my rifles?

Yes. The 30-caliber bore handles 5.56, .300 Blackout, .308, and larger magnum cartridges. That said, if 5.56 is your primary platform, a dedicated 5.56 suppressor will outperform it on that caliber. The Polonium 30 is the right choice when you want one can that does a solid job across multiple rifles.

What mounting system does this come with?

The Polonium 30 ships with a 5/8x24 direct-thread adapter and a tube clamp for installing different mounting systems. The rear of the suppressor has universal 1.375\"-24 threads, so you can choose KeyMo, Obsidian, Plan B, or other compatible mounts based on your preference.

How heavy is it, and will it balance on my rifle?

At 13.5 ounces (without a mount), the Polonium 30 is relatively light for a multi-caliber can. The aggressive external fluting reduces weight while maintaining strength and providing extra surface area for cooling.

Does it include everything I need to install?

The box contains the suppressor, a 5/8x24 direct-thread adapter, a tube clamp for mount changes, instruction materials, and stickers. If you're using a mounting system other than direct thread, you'll need to source the compatible mount separately.