Noveske Leonidas 5.56 12.5in Barrel STS

The Noveske Rifleworks Leonidas 12.5″ barrel is a compact AR-15 compatible barrel chambered for .223 Rem/5.56 NATO and built around a mid-length gas system. The barrel ships with a Noveske-designed, 1″ long gas block (included) and a gas tube; a standard 1.9″ front sight base will not fit this configuration. Barrel installation should be completed by a qualified gunsmith; installation of the gas block dowel pin and the gas block is required to finish assembly.

Key Specifications

• The barrel length is 12.5 inches.
• The caliber is .223 Rem/5.56 NATO.
• The barrel twist is 1:7.
• The gas system is a Mid Length Gas System.
• The barrel includes a pinned gas block and gas tube.
• The included gas block is 1 inch long.
• A standard front sight base of 1.9 inches will not fit this barrel.
• The finish/color is Silver.
• The model name is Leonidas.
• This barrel is designed to fit the AR-15 platform.

Purpose-built for AR-15 builds where a shorter, mid-length-gas barrel is desired, the Noveske Leonidas 12.5″ offers a compact, factory-configured option that includes the gas block and tube required for assembly. Its 1:7 twist and 5.56/.223 chambering support a broad range of loads, while the included pinned gas block simplifies setup for compatible gas block dimensions. For those assembling a lightweight or compact rifle configuration, this barrel provides a high-quality component from a known manufacturer and is intended to be installed by a qualified gunsmith to ensure proper headspace and gas alignment.