Yankee Hill Machine Black Plated Carbine Gas Tube. Our black plated gas tubes look better than a standard gas tube when used on our lightweight or diamond series forearms. Includes gas tube pin. Specifications for Yankee Hill Machine Black Plated Carbine Gas Tube YHM-BL-04A: Mfg Item Num: YHM-BL-04A Type: ACCESSORIES - GUN ACCESSORIES - GUN PARTS made in specialized factories: made in specialized factories Tactica: Tactical For: Carbine Master Model Header: Black Plated Gas Tubes The Yankee Hill Machine Black Plated Carbine Gas Tube YHM-BL-04A is a quality addition to the Yankee Hill Machine lineup. For more great deals on AR Gas Tubes by Yankee Hill Machine please browse our Yankee Hill Machine Gun Parts page.