KAK-5.25" 30 Luger AR15 Barrel- Nitride* Chamber- 30 Luger * Length- 5.25"* Threads- 5/8-24* Finish- Nitride * Twist- 1:10* Material- 41V50 Chrome Moly Vanadium* Marked for Caliber and Twist* Weight- 11.2 OZ* Fully Made In House From KAK Industry Produced BlanksAll Barrels Are Air Gauge Inspected for Correct Bore Size & Tolerances, completed Barrels are Inspected for Proper Headspace using Calibrated Gauging. WORKS WITH GLOCK OR UZI STYLE BUILDS