Battle Arms Development Gas Tube AR-15/AR-10 Mid Length 11.75 inch Stainless Steel. 6875in Carbine 9.8in Mid 11.75in Rifle 15.125 Specifications for Battle Arms Development AR-15/AR-10 Gas Tube: Manufacturer: Battle Arms Development Fabric/Material: Black Melonite Gun Model: AR-15 AR-10 Condition: New Package Contents: Battle Arms Development AR-15/AR-10 Gas Tube What firearm models does the manufacturer say Battle Arms Development AR-15/AR-10 Gas Tube is compatible with? The manufacturer suggests that Battle Arms Development AR-15/AR-10 Gas Tube is compatible with AR-15 AR-10Battle Arms Development ARGT-M-SS: Gas Tube AR-15/AR-10 Mid Length 11.75 inch Stainless Steel