The TREK is a short and rugged threadmount suppressor: a 5.56mm unit suitable for full auto and usage on modern shorter barrel (10.3 or greater) carbines. The TREK is made of rugged stainless steels and inconel with welded construction. - Caliber: 5.56mm NATO / .223 - Sound Reduction: 29 dB - Length: 5.7 - Diameter: 1.5 - Weight: 17.3 oz. - Materials: Stainless Steel & Inconel - Finish: Matte Black Cerakote with Reduced Visual-IR Signature - Mount: 1/2-28 (2A) Thread Mount - For Barrels: 10.3 or Longer