Silencer orders are fulfilled by one of our trusted partners, who will contact you to guide you through every step of the process. Please note that order cancellations may be subject to a fee. For full details on returns, warranties, and order policies, visit our Silencer T's & C's and FAQ pages Otter Creek Labs Polonium-30 .30 Cal 1.375 x 24 Suppressor with 5/8 x 24 Direct Thread Adapter - Black Cerakote - The Polonium-30 was developed after the proven success of the Polonium and Polonium-K in 5.56. It was built for shooters who want one suppressor that can do it all-without breaking the bank. Like every product we make, the Polonium-30 follows a simple philosophy: durable, high-performing suppressors at a price working people can afford. It's designed to deliver performance that exceeds expectations for its price point while maintaining the rugged reliability you demand. Let's be upfront about something important: when you run a .30 Caliber suppressor on a 5.56mm NATO rifle, you do give up some 5.56mm NATO -specific performance. That's simply the reality of bore size and physics. Any claim that a .30 Caliber suppressor performs identically to a dedicated 5.56mm NATO suppressor isn't telling the whole story. If your primary goal is absolute maximum performance on a 5.56mm NATO platform, the Polonium and Polonium-K in 5.56mm NATO will outperform the Polonium-30 on that cartridge. We'd rather be honest about that than oversell you. However, if you're looking for one versatile suppressor that can move between multiple rifles and still deliver strong, dependable performance across the board, the Polonium-30 is built for exactly that role. It's rated for everything from full-auto short-barreled 5.56 rifles and 300 Blackout to .308, all the way up to hard-hitting magnums like 300 RUM and 300 Norma Magnum. The Polonium-30's distinctive appearance comes from strategic external weight reduction. By removing unnecessary material while preserving structural strength, we've created a suppressor that's lighter, stronger, and features 10% more surface area. The result? Faster heat dissipation and quicker cooldown times. An integrated internal and external flash hider system provides excellent flash and signature reduction, particularly beneficial for shooters running night vision. The Polonium-30 also features industry-standard 1.375 x 24 universal rear threads, allowing you to choose the mounting system that best fits your setup. If you want one suppressor that can handle nearly anything you own-while staying honest about its strengths-the Polonium-30 delivers. 1.375 x 24 Universal Rear Suppressor Threads ; 5/8 x 24 Direct Thread Adapter ; After you place your order, you will be contacted by one of our fulfillment partnerswith additional info about next steps. A $10 Paperwork Processing fee will be charged for each suppressor. Purchases, cancellations, returns, and warranty claims for silencers/suppressors are subject to our Silencer Terms and Conditions . All silencer sales are final. Once a silencer is transferred to you, it cannot be returned. See our Silencer Terms and Conditions for warranty details. Please review our frequently asked questions (FAQs) and answers about silencers. Click here to review.