Guntec USA AR-15 Multi Port Steel Compensator Anodized Black. 56 Cal 1/2 X 28 Threads Just Released Specifications for Guntec USA AR-15 Cal Multi Port Steel Compensator: Manufacturer: Guntec USA Caliber: .223 Remington Fabric/Material: Steel Gun Model: AR-15 Condition: New Package Contents: Guntec USA AR-15 Cal Multi Port Steel Compensator What firearm models does the manufacturer say Guntec USA AR-15 Cal Multi Port Steel Compensator is compatible with? The manufacturer says that Guntec USA AR-15 Cal Multi Port Steel Compensator is compatible with AR-15GUNTEC USA TANK9-223-G2: AR-15 Cal Multi Port Steel CompensatorAnodized Black