OCL Polonium K 5.56/6mm Steel Suppressor - Flat Dark Earth Finish

OCL Polonium K 5.56/6mm Steel Suppressor - Flat Dark Earth Finish

Compact, rugged, and built for real-world performance—the Otter Creek Labs Polonium K 5.56/6mm Suppressor – FDE delivers duty-grade suppression in a shorter, lighter package. Designed as the “K” (compact) variant of the proven Polonium lineup, this suppressor is optimized for shooters who want reduced size, lower backpressure, and dependable performance without sacrificing durability.

Engineered for hard use, the Polonium K is constructed from H900 heat-treated 17-4 stainless steel in a fully welded, tubeless design—built to withstand aggressive firing schedules, including full-auto use. Its 6mm bore allows compatibility with both 5.56/.223 and 6mm/.243 cartridges, making it a versatile choice for duty carbines and SPR builds.

The Polonium K’s signature ribbed exterior isn’t just for looks—it removes unnecessary weight while increasing surface area by approximately 10%, allowing for faster heat dissipation and quicker cooldown times. Combined with its integrated internal and external flash hider, this suppressor significantly reduces flash signature, making it ideal for low-light or night vision applications.

Finished in Flat Dark Earth (FDE) and featuring universal 1.375x24 rear threads, the Polonium K gives you the flexibility to run your preferred mounting system while maintaining a compact, mission-ready profile.

Compact K-Length Design
Short 4.8" profile reduces overall weapon length and improves maneuverability.

Duty-Rated Durability
H900 heat-treated 17-4 stainless steel construction built for extreme use, including full-auto firing.

Reduced Backpressure
Optimized design minimizes gas blowback compared to full-size suppressors.

6mm Bore Compatibility
Supports 5.56/.223 and 6mm/.243 cartridges for added versatility.

Enhanced Heat Dissipation
Ribbed exterior increases surface area by ~10% for faster cooling during sustained fire.

Integrated Flash Suppression
Built-in internal and external flash hider reduces visible signature in low-light environments.

Universal Mounting Platform
1.375x24 rear threads allow compatibility with a wide range of mounting systems.

Lightweight Performance
Weighs just 11.5 oz (without mount), maintaining balance and handling.

FDE Finish
Durable coating with a tactical Flat Dark Earth aesthetic.

Specifications

• Caliber: 5.56/.223 and 6mm/.243
• Length: 4.8 inches
• Weight: 11.5 oz (without mount)
• Outer Diameter: 1.625 inches
• Material: H900 Heat-Treated 17-4 Stainless Steel
• Construction: CNC welded, tubeless design
• Mounting: 1.375x24 (HUB compatible)
• Finish: Flat Dark Earth (FDE)
• Bore Size: 6mm
• Full-Auto Rated: Yes (responsible use, ≤300 round strings before cooldown)
• Barrel Restrictions:
  • 5.56 / .223 / 7.62x39: 7.5 inches minimum
  • 6 ARC / 6.5 Grendel: 10.5 inches minimum
  • .308 / 6.5 CM / .243 Win: 12.5 inches minimum
  • Magnum Calibers: 16–18 inches minimum depending on cartridge