Our AR15/M16 Mid-Length gas tube is constructed of Hardened Stainless Steel for strength and durability. The AR15/M16 Mid-length gas tube is Heat & Corrosion resistant 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/M16 or sourcing parts for replacement or upgrade. It Pins into front sight or gas block, No gunsmithing is required.