Otter Creek Labs Polonium K 5.56 Suppressor – Compact Duty-Rated HUB Compatible Rifle Silencer - Black

Otter Creek Labs Polonium K 5.56 NATO Suppressor

The Otter Creek Labs Polonium K is a compact, duty-rated suppressor designed specifically for shooters who demand durability, sound suppression, and reliability from their 5.56 rifle suppressor. Built from H900 heat-treated 17-4 stainless steel, the Polonium K delivers exceptional strength while maintaining a compact and lightweight profile.

Designed as the shorter version of the popular Polonium suppressor, the Polonium K offers reduced length, lighter weight, and lower back pressure while still providing impressive suppression performance. Whether mounted on a hard-use MK18, patrol rifle, SBR, SPR, or general-purpose AR-15, the Polonium K is engineered to perform under demanding conditions.

Its distinctive exterior profile is the result of strategic material removal that reduces weight while maximizing strength. This design increases surface area by approximately 10%, allowing the suppressor to dissipate heat faster and cool more efficiently during extended firing sessions.

Quick Overview

The Polonium K is a compact 5.56 suppressor optimized for hard-use applications. Featuring HUB compatibility, full-auto durability, excellent flash suppression, and reduced back pressure, it delivers outstanding performance for shooters seeking a lightweight suppressor without sacrificing reliability.

Built for Hard Use

From high-volume training to duty applications, the Polonium K was engineered to withstand extreme use. Its robust H900 heat-treated stainless steel construction provides exceptional resistance to heat, erosion, and wear, making it suitable for demanding firing schedules and professional applications.

Superior Flash Reduction

The Polonium K incorporates highly effective internal and external flash-hiding features that dramatically reduce muzzle flash and visual signature. This makes it particularly attractive for low-light shooting and night vision applications where flash suppression is critical.

Universal HUB Compatibility

Featuring industry-standard 1.375x24 HUB threads, the Polonium K allows users to choose from a wide range of direct-thread and quick-detach mounting systems. Included with the suppressor is a 1/2x28 direct thread adapter and tube clamp for immediate installation.

Key Features

• Compact K-length suppressor design
• Duty-rated hard-use construction
• H900 heat-treated 17-4 stainless steel construction
• Full-auto rated
• Reduced back pressure compared to full-size models
• Excellent flash suppression performance
• Enhanced cooling through increased surface area design
• Industry-standard HUB compatible mounting system
• 1.375x24 rear thread interface
• Compatible with 5.56 NATO and 6mm/.243 cartridges
• Cerakote Black finish
• Includes 1/2x28 direct thread adapter
• Includes tube clamp for mount installation

Specifications

Why Choose the Polonium K?

The Otter Creek Labs Polonium K delivers an outstanding balance of suppression, durability, flash reduction, and compact handling. Its HUB compatibility, full-auto rating, and low-back-pressure design make it one of the most versatile compact 5.56 suppressors available for modern AR-15 platforms, duty rifles, and short-barreled carbines.