Otter Creek Labs Polonium K – 5.56 Silencer


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Polonium-K 5.56

The Polonium is made to be a quiet, duty rated, hard use 5.56 suppressor and is offered in both standard and K length options. If you’re looking for the best size, weight and price to sound performance ratio on the market that you can beat the absolute crap out of then look no further than the Polonium series. We don’t need to make up fake, fancy marketing language or give you padded/deflated dB numbers taken on subpar equipment – the reputation, performance and track record of the Polonium and Polonium-K speak for themselves.

The Polonium uses a 6mm bore that is also compatible with any 6mm/.243 cartridges and has a highly effective built in internal and external flash hider that offers superior flash reduction over the competition when using night vision or when shooting in low light conditions. The unique look comes from external weight reduction, removing all unnecessary material to keep the weight down but still as strong as possible. This results in a suppressor that has 10% more surface area depending on the length that will shed heat and cool down quicker.

The Polonium and Polonium-K features industry standard universal 1.375×24 rear threads so you can pick what mounting system best fits your needs.


The Polonium series of suppressors are made from H900 heat treated 17-4 stainless steel and constructed as a CNC welded tubeless design.

Length: Polonium & Polonium-30 — 5.8, Polonium-K — 4.8”

Weight: Polonium & Polonium-30 — 13.5 oz, Polonium-K — 11.5 oz (weights taken with no mount)

OD: 1.625”


Barrel length restrictions

7.5” – 5.56/223 and 7.62×39

10.5” – 6 ARC, 6.5 Grendel and other similar cartridges

12.5” – 308, 6.5 creedmoor, 6mm creedmoor, 243 winchester and other similar cartridges

16” – 300 win mag, 7mm rem mag, 300 PRC and other similar cartridges

18” – 300 RUM and 300 Norma mag

Full auto rated – no BS. Responsible belt fed rated on 16” 5.56 belt fed machine guns. Do not exceed 300 round strings without cool down.

*IMPORTANT NOTE* These are the listed barrel length restrictions for all of the Polonium series (Pol, Pol-K, Pol-30). You CANNOT shoot 6.5 or 7.62 projectiles through the 5.56 Polonium or Polonium-K. Meaning the 16” 300 win mag restriction applies to the polonium-30 and not the polonium 5.56 because you cannot shoot 300 win mag through the 5.56 suppressor. You would think something like that doesn’t need to be said but you’d be surprised.



The Polonium, Polonium-K and Polonium-30 are backed by our no BS lifetime warranty. Read the warranty page for more.

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