V Seven Helios-K Linear Compensator 1/2X28 for 5.56 Black MBHEK 556 BLK. Specifications for V Seven Helios-K Linear Compensator: Manufacturer: V Seven Fabric/Material: Grade 5 Titanium Length: 2.5 in Outer Diameter: 1.115 in Weight: 2.2 oz Features of V Seven Helios-K Linear Compensator Muzzle device designed for cqb type weapons Can be used with any barrel length Directs muzzle blast and sound signature forward away from shooter The helios moderately suppresses flash & reduces recoil Diameter 1.115in tucks nicely into handguards Package Contents: V Seven Helios-K Linear Compensator V Seven MBHEK 556 BLK: Helios-K Linear Compensator 16.5in 1/2X28 for 5.56 Black