Rosco Manufacturing Melonite Intermediate Length Gas Tube Intermediate Length Black 15in. These gas tubes work great under a handguard because they are more durable than standard gas tubes. These gas tubes are compatible with barrels configured with a mid-length length gas system. Does not include roll pin. Specifications for Rosco Manufacturing Melonite Intermediate Length Gas Tube: Manufacturer: Rosco Manufacturing Color: Black Fabric/Material: 4140 Steel Gas System Length: Intermediate Gun Make: AR Platform Gun Model: AR-15 Caliber: 5.56x45mm NATO Package Contents: Rosco Manufacturing Melonite Intermediate Length Gas Tube What firearm models does the manufacturer say Rosco Manufacturing Melonite Intermediate Length Gas Tube is compatible with? The manufacturer says that Rosco Manufacturing Melonite Intermediate Length Gas Tube is compatible with AR-15Rosco Manufacturing ROS-GT-I-001: Melonite Intermediate Length Gas Tube Intermediate Length Black 15in