Otter Creek Labs Polonium K

The Otter Creek Labs Polonium K is a compact, high-performance 5.56 suppressor engineered for shooters who demand maximum strength and minimal blowback in a shorter, lighter package. Designed as the smaller sibling to the full-size Polonium, the Polonium K maintains exceptional sound suppression and accuracy while offering improved maneuverability and reduced weight.

Constructed from H900 heat-treated 17-4 stainless steel, this suppressor is full-auto rated and built to endure extreme firing schedules. The internal baffle geometry is optimized for minimal gas blowback, delivering smoother operation on both direct impingement and piston-driven rifles.

The Polonium K features a 1.375×24 HUB-compatible mount, giving users flexibility with popular mounting systems like KeyMo, Xeno, and direct thread adapters. Its compact size makes it ideal for shorter barrel setups, SBRs, or anyone seeking a balance between suppression performance and handling speed.

Key Features & Specifications

• Caliber: 5.56 NATO / .223 Remington

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

• Finish: High-temp Cerakote

• Mount: 1.375×24 HUB compatible

• Full-auto rated construction

• Reduced blowback design for cleaner, smoother cycling

• Length: 4.9 inches

• Weight: Approx. 12 ounces

• Designed and manufactured in the USA

Compact, durable, and optimized for tactical performance, the Otter Creek Labs Polonium K delivers reliable suppression in a streamlined form factor — perfect for modern carbines and compact rifles.