The si jcomp v2 is the classic type 89 compensator re-engineered and updated for the 21st century.This compensator has an increased muzzle rise compensation, and is compatible with oppressor and ferfrans concussion reduction devices.The j-comp concept comes from the type 89 japanese assault rifle used by the japan self-defense forces, the japan coast guard's special security team units, and the special assault team.Finish: BlackType: CompensatorModel: JCompDimensions: 2.50"Size: 223 Remington/5.56 NATOMaterial: SteelThread Pattern: 1/2"-28 tpi