The Otter Creek Labs Polonium K is a dedicated 5.56 NATO/.223 Remington suppressor engineered to balance sound reduction, weight, and durability in a compact package. Using H900 heat-treated 17-4 stainless steel in a tubeless, welded construction, the Polonium K supports sustained operation by shedding heat efficiently while resisting corrosion and wear common to extended fire sequences.

External geometry features sculpted contours that both reduce mass and increase surface area for thermal dispersion, and the direct-thread mount accepts the included 1/2×28 adapter for straightforward installation on compatible rifles. The design also incorporates a universally threaded rear interface to support optional QD mounts or adapters when desired, making the Polonium K a versatile choice for service rifles, patrol carbines, and precision platforms.

Specifications

• Manufacturer: Otter Creek Labs

• Model: Polonium K 5.56

• Caliber: 5.56 NATO / .223 Remington

• Bore Size: ~6 mm

• Length: ~5.8 in

• Weight: ~13.5 oz

• Material: H900 heat-treated 17-4 stainless steel

• Finish: Black

• Mounting: Direct thread (1/2×28 adapter included)

• Thread Pattern: 1/2×28 direct thread and 1.375×24 rear interface