The San Tan Tactical 1836 Series Ironclad barrel is an 11.5-inch AR-15 barrel chambered in 5.56 NATO. It uses a carbine-length gas system, a common setup for compact rifles and pistols at this length. A black nitride finish protects the bore and exterior against wear and corrosion.
- Series: 1836 Ironclad
- Fits: AR-15
- Caliber: 5.56 NATO
- Length: 11.5 in.
- Gas system: Carbine length
- Finish: Nitride, black
- Manufacturer part number: STT-1836I-115B-556-N
