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.
30 reviews for Otter Creek Labs Polonium K Suppressor
Only logged in customers who have purchased this product may leave a review.
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Blake B –
Great can
Christian D –
The absolute best noise reduction you can get for the price and size
Lyndon B –
OCL Polonium Suppressor is a great value!
Russell C –
1st took 65 days….2nd took 5 days
John G –
Excellent suppressor, very economical cost. Works great on my KUSA KP9 and Henry Big Boy X 357.
Christopher S –
This is my favorite suppressor I own. It has great sound reduction, is very weight conscious on design, and has one of the best prices on the market. When I had an issue with a mount failing, Otter Creek warrantied the product with no fuss. I immediately went and bought another the next day because of this experience. Otter Creek makes great products.
DeWayne Sims –
Perfect size for what i need it for
Kade E –
Buy it great
Loyd D –
Compact, but full of great features, all while remaining very affordable.
MAX K –
Great can, swapped the direct thread for a rearden atlas with a LPM brake, works great, surprisingly quiet, great for the $$
James W –
Best bang for buck.
Terrence Duffield –
These are not a secret anymore. Best full auto rated cans for price in the game right now
Jason A –
Very nice can for the money. Only have got to shoot it on a 14.5 and 16 inch 5.56. plan on trying it on 243 win some day. Probably live on the 14.5, at least while its at home.
Andrew G –
Excellent value for a great suppressor. The shorter length is an added bonus and it paired seamlessly with a Dead Air Keymo. Highly impressed with this and the price was frankly surprising for the quality. Get you one ASAP.
Devon V –
Absolutely the quietest silencer I’ve purchased, can shoot an 11.5 without ears, very comfortably.
Jeff J –
First dedicated 5.56 can. Had a chance to run it a few days after picking it up and it tamed a 14.5” and 16” very well. No discomfort on the ears with short strings. It’s well documented but there’s a noticeable uptick in gas with an H1 and H2 buffer and Sprinco blue spring and also a flat wire spring. Will do some more testing on shorter barrels but will be installing YHM Suppressor gas block and will drill until reliable cycling without can. Tone was similar to a AB A-10 7.62 which is another great low cost/high value can. The Polo-K is a very good value for the firing schedule it’s rated for. Weight is good for a 1.625” welded can. Blast baffle looks eerily similar to a Saker K…
OverCookedRock –
Haven’t shot it yet as I’m waiting for parts to complete the build it’s going on but couldn’t be more excited. The can is built like a tank and aesthetical I love it’s simplicity and no frills. Can’t wait to take it out. This is also my first can 🙂
Esteban G –
Great product – affordable and gets the job done
Garrson Turner –
Awesome suppressor. Seriously impressed considering the size. I run it on a 10.5″ 5.56 SBR and I’m surprised at the performance for a <6" can. Nice work, Otter Creek!
Jared B –
This was my first dedicated 5.56 suppressor. Imo it looks good, has the ability to except popular hub mounts and its looks bery rugged. It worked great on my Ar rifle. It’s quiet enough so I can shoot it without ear protection. I’m running it on a rosco 14.5″ mid length gas barrel with a H2 buffer and i was getting 3′ o clock ejections. I am very happy with the purchase. If your on a budget, this suppressor is an affordable option without having to sacrifice quality. Im confident it will last a very long time, it looks like it’s built to last.
Shawn C –
Very please with the performance and value of the polo k. Silencer Shop kiosk made my first form 4 process super simple and easy.
Brad Gates –
The Polonium k is one I stumbled across while searching for a small dedicated 556. And the hype is real! Light compact and very quiet all while being super affordable. I tested it side by side with a buddy and his 30 cal on a 300BO and then difference was there but small! For half the price and half the size this thing is amazing! Would buy again and would definitely recommend.
That said this is my first K can and it’s a bit smoky, from all the video footage I watch it seems like this is most cans that size that don’t flow forward. But once again leaning on the cost vs performance I can’t complain as a can that would mitigate that would double my price and likely be bigger and heavier.
The Polonium k rocks!
Joshua M –
I cannot be happier with this purchase. It works as intended, incredibly small and was exactly what I was looking for. I appreciate the opportunity to be able to purchase and use this suppressor.
Michael T –
This is a very good product. Well made and works great. Makes shooting more enjoyable.
Valice C –
Well made, performs as expected, and is not going to break your budget, very satisfied with my purchase.
Danphi D –
Great can, works great with carbine and mid length
BEN R –
Get a rearden hub and muzzle device and you’ve got a fantastic HBP can for your AR.
Paul C –
Solid can.
Julian M –
10/10 favorite can
Anthony F –
Amazed by the performance of this small and affordable suppressor. Great on 5.56, 22ARC and 243. Sound suppression is just as good as some of my much longer cans.