Tacfire AR15 Pistol Length gas tube is constructed of 304 Hardened Stainless Steel for strength and durability. The AR15 Pistol gas tube is Heat & Corrosion resistant from elements to ensure consistent gas flow to help your rifle cycle properly. This AR15 gas tube fits most Pistol length gas systems. This is great if you're building an AR15, or sourcing parts for replacement or upgrade. It Pins into front sight or gas block, No gunsmithing is required.