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Needs an ATF Form 4, a $200 tax stamp and an approval wait. The dealer's fee is on top.
Otter Creek Labs
Overview
The Otter Creek Polonium K 556 Rifle Suppressor is designed specifically for 5.56 NATO caliber firearms, providing a significant reduction in noise and muzzle rise. Its sleek black finish not only adds a tactical aesthetic but also offers durability in various shooting conditions. This suppressor is commonly found on builds with a carbine gas system, making it a popular choice for those looking to enhance their AR-15 performance while maintaining compactness and ease of use.
Otter Creek Polonium K 556 Rifle Suppressor - Black was the second most added suppressor on GunPartPicker in September 2026, behind the SilencerCo Velos LBP 556 Rifle Suppressor, Black, with about 6% of all suppressors added to builds. Up from #4 in August. Builds with this suppressor are mostly chambered in 5.56 NATO (85%, then .223 Wylde 8%), split between mid-length (51%) and carbine-length (35%) gas systems, and nearly all AR-15.
It was hard to find in September 2026, in stock on only 10 of the 28 days we checked, and today 2 of the 4 retailers we track have it in stock. Prices barely moved in September 2026, holding around $522, so there haven't been real sales lately. Buying today, the lowest price is $522 at BattleHawk Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every suppressor by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Suppressor Guide →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Otter Creek Polonium K 556 Rifle Suppressor - Black
| Build | Parts | Total |
|---|---|---|
| Ar-15 | 21 | $2201.02 |
 | 16 | $4601.26 |
 | 6 | $1307.06 |
 | 32 | $5931.57 |
 | 37 | $6591.87 |
 | 16 | $1942.17 |
| 19 | $2870.33 |
 | 10 | $2746.44 |
 | 34 | $5625.41 |
 | 13 | $4691.70 |
 | 19 | $3705.82 |
 | 37 | $4380.11 |
3 global ratings
Top reviews
Otter Creek Polonium K 5.56 rifle suppressor is 10/10 for a rifle can. Suppression reduces tone signature meaningfully. Mount holds zero through removal cycles. Black finish is durable. Solid Otter Creek build quality throughout.
Otter Creek Polonium K 5.56 rifle suppressor reduces tone signature meaningfully. The black finish has a slightly different shade than my other black accessories in direct light. Suppression performance matches expectations. Solid rifle can.
Otter Creek Polonium K 5.56 rifle suppressor install was a bit fiddly because the QD mount required precise alignment with my muzzle device. Once locked on it stays put. Suppression performance is in the expected range for a Polonium.
