The Otter Creek Labs Polonium K is a compact, duty-rated suppressor chambered for 5.56. Constructed from H900 heat-treated 17-4 stainless steel with a 6mm bore, it features a 1/2×28 direct-thread adapter and weighs 11.5 oz.
The Otter Creek Labs Polonium K is a compact, duty-rated suppressor designed for 5.56 use. It is constructed from H900 heat-treated 17-4 stainless steel and uses a CNC welded tubeless design with a 6mm bore. The K configuration provides a shorter, lighter profile intended for duty use and precision DMR/SPR applications.
Product Specifications
The caliber is 5.56 NATO.
The model is Polonium K.
The manufacturer is Otter Creek Labs (OCL).
The material is H900 heat-treated 17-4 stainless steel.
The suppressor uses a 6mm bore compatible with 6mm/.243 cartridges.
The standard direct thread pattern is 1/2X28.
The rear universal thread standard is 1.375×24.
The overall length is listed as 4.8 per manufacturer specifications.
The outside diameter is listed as 1.6250 per manufacturer specifications.
The weight is 11.5 oz (mount not included).
This suppressor is full-auto rated according to the manufacturer.
Included in the box are a 1/2×28 direct-thread adapter, tube clamp, stickers, and an instruction pamphlet.
The UPC is 664533654156.
The manufacturer’s part number is POLK.
Compact and purpose-built, the Polonium K balances reduced weight and a short profile with a duty-rated construction that suits professional and precision-oriented users. Its tubeless CNC-welded design and included direct-thread adapter make it straightforward to integrate into a variety of 5.56 AR-style builds and dedicated precision platforms.
Users commonly praise its duty-rated durability and compact, lightweight design.
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