Tacfire AR15/M16 Carbine Length gas tube is constructed of Hardened Stainless Steel for strenght and durability. The carbine gas tube is Heat & Corrosion resistant to ensure consistent gas flow to help your rifle cycle properly. This AR15 gas tube fits most carbine length gas systems. This is great if you're building an AR15/M16, or sourcing parts for replacement or upgrade. It Pins into front sight or gas block, No gunsmithing is required.