Otter Creek Labs Polonium K Suppressor FDE (5.56)

Otter Creek Labs Polonium K Suppressor FDE (5.56)


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The same durability as the full size version, now with a smaller overall length.


The Otter Creek Labs Polonium K is made to be a quiet, duty rated, hard use, 5.56 suppressor in the K (Short) configuration. The Polonium K is just as much at home on a MK18 getting hammered with heavy strings of fire as it is on a DMR/SPR set up where ultimate suppression is the goal. Just like the Polonium, the Polonium K uses a 6MM bore that is compatible with any 6MM/.243 cartridges. The highly effective built in internal and external flash hider offer superior flash and signature reduction over the competition when using night vision. The Polonium K also features industry standard universal 1.375-24 rear threads so you can pick what mounting system best fits your needs.



  • Length: 4.8” (no mount)
  • Weight: 11.5 oz (no mount)
  • OD: 1.625”
  • Tubless Design
  • H900 Heat Treated 17-4 Stainless Steel


Barrel length and firing schedule restrictions

  • 10.3” – 5.56/223
  • 11.5” – 6 ARC
  • 14.5” – 6 Creedmoor, 6 Dasher, 243 Winchester, and other 6MM cartridges.
  • Full auto rated – no BS.


What’s included in the box?

  • Suppressor
  • Stickers
  • Instruction and specs pamphlet
  • 1/2×28 direct thread adapter
  • Tube clamp for installing mounts


Otter Creek Labs discourages the use of pronged flash hiders such as the Deadair 3 prong, and SOLGW nox on barrels shorter than 12.5 inches. Pronged flash hiders do speed up wear on ANY suppressor. This is just simply a recommendation, not a requirement.

Additional information

Weight 1.80 lbs
Dimensions 12 × 8 × 5 in


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