Otter Creek Labs Polonium K Suppressor

Otter Creek Labs Polonium K: Big Performance in a Short Package
If you’re running drills, shooting under NODs, or stalking hogs at last light, the Polonium K brings serious performance without adding unnecessary length. At just 4.8 inches, this 5.56K suppressor delivers top-tier sound and flash reduction in a lightweight, hard-use design.
Crafted from 17-4 stainless steel and rated for full-auto use, the Polonium K handles high-volume fire without hesitation. Its erosion-resistant baffle design and 6mm bore make it equally capable on 6 ARC, 6mm Creed, or your favorite .223 rifle. Gas management is improved, too—fewer fumes in your face when you’re behind the gun.
An integrated flash hider cuts your visible signature in low light, while HUB-compatible 1.375×24 rear threads let you choose your preferred mounting setup. Whether you’re using the included 1/2×28 direct thread or swapping in a QD system, the Polonium K adapts fast.
KEY ATTRIBUTES OF THE OTTER CREEK LABS POLONIUM K
Lightweight Construction: The OCL Polonium K weighs just 11.5 oz, but packs peak performance and durability.
Compact Design: With a total length of under 5 inches, you’ll hardly notice it on the end of your rifle.
Flash Suppression: Reduces pressure and flash to lower your signature in low-light conditions.
Universal Compatibility: 1.375×24 rear threads make it easy to mount on a variety of setups.
Competitive Noise Suppression: Delivers top-tier decibel reduction for its size.
TECHNICAL SPECIFICATIONS:
Length: 4.8″
Diameter: 1.625″
Weight: 11.5 oz
Material: 17-4 Stainless Steel
Full Auto Rated! 
BARREL LENGTH AND FIRING RESTRICTIONS
7.5” – 5.56/223
10.5” – 6 ARC
12.5” – 6 Creedmoor, 6 Dasher, 243 Winchester and other 6mm cartridges 
WHAT’S IN THE BOX
OCL Polonium-K Suppressor
1/2×28 Direct Thread Adapter
Tube Clamp
Owner’s Manual
HOW TO BUY THE OCL POLONIUM K WITH SILENCER SHOP
Add the Otter Creek Labs Polonium-K to your cart. Make sure to include a tax stamp for each item, and a Single Shot Trust if applicable. The Single Shot Trust makes it easy to add friends and family as additional users of the suppressor. 
Head to your selected Powered By Silencer Shop dealer with a kiosk to complete your demographic info and fingerprint scan in just five minutes. Snap a selfie and upload it online within your customer portal with the Silencer Shop app.
Silencer Shop will email a DocuSign to you. Please review and digitally sign the file from your computer or mobile device.
Set up your ATF eForms account at eforms.atf.gov. Make sure your email, name, and address match your Silencer Shop profile information exactly.
You’ll receive an email from Silencer Shop that says “Ready to Certify” and includes the phone number of your local Powered by Silencer Shop dealer. Set up a time to certify and submit the form to the ATF for processing.