The Otter Creek Labs Polonium K is a compact, purpose-built 5.56 NATO rifle suppressor designed for shooters who prioritize maneuverability without sacrificing strength or reliability. With a streamlined 4.8-inch overall length, the Polonium K offers effective suppression in a short, lightweight configuration ideal for carbines, SBRs, and duty-style rifles.

Constructed from H900 heat-treated 17-4 stainless steel, the Polonium K is engineered to withstand high pressures and sustained firing schedules while maintaining long-term durability. This robust construction makes it suitable for demanding use, including full-auto applications within specified limits.

The suppressor features a durable black Cerakote finish that enhances corrosion resistance and protects against wear in harsh environments. Its 1.375x24 mounting interface allows compatibility with common suppressor mounting systems, while the included 1/2x28 direct thread adapter ensures straightforward installation on standard 5.56 NATO barrels.

With an outer diameter of 1.625 inches and a weight of just 11.5 ounces, the Polonium K strikes an excellent balance between sound reduction and handling. Barrel restrictions begin at 7.5 inches, allowing flexibility across a wide range of rifle configurations. The suppressor is also full-auto rated for use on 16-inch 5.56 belt-fed platforms with a recommended 300-round string limit.

Each Polonium K includes essential accessories to support proper setup and use, including a direct thread adapter, a tube clamp for mounting, and an instruction and specifications pamphlet. This complete package ensures reliable installation and long-term performance.

Key Features

• Manufacturer: Otter Creek Labs
• Model: Polonium K
• Type: Rifle Suppressor (NFA Item)
• Caliber: 5.56 NATO
• Material: H900 Heat-Treated 17-4 Stainless Steel
• Finish: Black Cerakote
• Mounting Interface: 1.375x24
• Attachment Method: 1/2x28 Direct Thread (Included)
• Length: 4.8 in
• Outer Diameter: 1.625 in
• Weight: 11.5 oz
• Barrel Restrictions: Minimum 7.5 in
• Full Auto Rating: Approved for 16" 5.56 belt-fed with 300-round string limit

What’s Included

• Otter Creek Labs Polonium K Suppressor
• 1/2x28 Direct Thread Adapter
• Tube Clamp for Mounting
• Instruction & Specifications Pamphlet

Note: This item is regulated under the National Firearms Act (NFA). All applicable federal, state, and local laws apply. Always verify barrel length and usage restrictions prior to installation.