Rosco Manufacturing Bloodline Melonite Gas Tube Carbine Length Black. These gas tubes work great under a handguard because they are more durable than standard gas tubes. Available in pistol carbine mid-length and rifle lengths. Does not include a roll pin. Specifications for Rosco Manufacturing Melonite Gas Tube: Manufacturer: Rosco Manufacturing Color: Black Finish: Melonite Condition: New Country of Origin: USA Features of Rosco Manufacturing Melonite Gas Tube Stainlees Steel Construction Perfectly Polished Melonited Expertly Bored Gas Port Gas Tight Flared End Package Contents: Rosco Manufacturing Melonite Gas Tube Rosco Manufacturing Ros-GT-C-001: Melonite Gas Tube Bloodline Series Carbine Length Black