Features: 12 separate expansion chambers Reduce Noise Gases escape straight from the front of the compensator, hence free float hand guards and rail systems like the HERA-ARMS IRS can overlap on the compensator Easy Installation Length: 3.55" Diameter: 1.23" Made in Germany223 / 5.56 Linear Compensator for use on short barreled rifles. The inside design with 12 separate expansion chambers leads blast and noise straight forward to increase shooting comfort and reduce noise at the shooters ears. Generation 2 with 30% less weight and a reduced outside diameter for perferct fit under our IRS handguard system. Available with 5/8 x 24" threads. Cal. max. 7,62 mm with Barrel Thread 5/8"x24