Product Overview
Otter Creek Labs Polonium K – Compact 5.56 Suppressor
The Otter Creek Labs Polonium K is a short, hard-use 5.56 suppressor designed for shooters who demand great at-ear suppression and durability in a compact footprint. It maintains excellent sound performance while shedding length and weight compared to the full-size Polonium.
Compact Size, Serious Performance
The Polonium K is tuned to deliver impressive sound reduction and a well-balanced shooting experience on 5.56 platforms. External material has been aggressively reduced to lower weight and increase surface area, helping the suppressor cool faster between strings of fire.
- Short K-length design for improved handling and maneuverability
- Excellent at-ear suppression relative to its size
- Reduced back pressure to keep gas out of the shooter’s face
- Ideal for SBRs, AR pistols, and duty carbines
Duty-Rated Construction
Constructed from H900 heat-treated 17-4 stainless steel in a tubeless design, the Polonium K is built to withstand heavy firing schedules, including full-auto and belt-fed use on appropriate hosts.
- H900 heat-treated 17-4 stainless steel for maximum strength and durability
- Tubeless construction to minimize unnecessary material and weight
- Designed for hard-use, duty, and training applications
Key Features & Benefits
- Caliber: 5.56 NATO with 6mm bore compatibility (per manufacturer)
- Length: approx. 4.8" (no mount)
- Weight: approx. 11.5 oz (no mount)
- OD: approx. 1.625"
- Universal 1.375x24 rear threads for popular mounting systems
- Full-auto and belt-fed rated within manufacturer guidelines
Barrel Length & Firing Schedule
Follow Otter Creek Labs’ barrel length and firing schedule guidelines to get the most out of your Polonium K while preserving service life.
- 5.56 / .223: minimum 10.3" barrel
- 6 ARC: minimum 11.5" barrel
- Common 6mm cartridges (e.g. 6 Creedmoor, .243 Win): minimum 14.5" barrel
- Rated for responsible full-auto and belt-fed use on appropriate hosts
Specifications
| Brand | Otter Creek Labs |
|---|---|
| Product Name | Polonium K |
| SKU | OCL-POLONIUM-K |
| Caliber | 5.56 NATO (6mm bore compatible per manufacturer) |
| Overall Length | 4.8" (no mount) |
| Diameter | 1.625" OD |
| Weight | 11.5 oz (no mount) |
| Mount Interface | 1.375x24 universal rear threads |
| Material | H900 heat treated 17-4 stainless steel |
| Finish | Protective coating (commonly black Cerakote; color options may vary) |
What’s Included
- Polonium K suppressor
- Direct-thread adapter (per current packaging)
- Documentation and included accessories from Otter Creek Labs
Zeroed Solutions NFA & Setup Support
Zeroed Solutions can walk you through choosing the right mounts, configuring your 5.56 rifle for suppressed use, and completing all NFA paperwork and fingerprinting in-house for a smoother ownership experience.
