Otter Creek Labs Polonium K Suppressor 5.56 POLK

The Polonium K is engineered from heat-treated 17-4 stainless steel, which allows it to maintain structural integrity under high pressure and sustained firing schedules. Its compact 4.8-inch profile and 1.625-inch outer diameter create a suppressor that balances maneuverability with effective noise reduction for carbine and rifle use. The included 1/2×28 direct thread adapter ensures compatibility with standard 5.56 platforms while maintaining secure mounting.

This model is full auto rated when used on 16-inch 5.56 belt-fed machine guns with a recommended limit of 300-round strings. A tube clamp is included to support proper installation of mounts and accessories, along with an instruction and specifications pamphlet for clear guidance. Barrel restrictions begin at 7.5 inches, which allows for flexibility across shorter systems while maintaining safe operating margins.

Specifications:

• Manufacturer: Otter Creek Labs
• Model: Polonium K
• Type: Rifle Suppressor
• Caliber: 5.56 NATO
• Mounting Thread: 1.375×24
• Material: H900 Heat Treated 17-4 Stainless Steel
• Finish: Cerakote Black
• Length: 4.8 in
• Weight: 11.5 oz
• Outer Diameter: 1.625 in
• Barrel Restrictions: Minimum 7.5 in
• Full Auto Rating: Suitable for 16 in 5.56 belt-fed with 300 round string limit
• Includes: Instruction and specs pamphlet, 1/2×28 direct thread adapter, Tube clamp for mounting