Nylaug* Chamber- 300 BLK* Length- 16.5"* Gas system- Piston* Threads- 5/8-24* Finish- Black Oxide * Twist- 1:7* Material- 41V50* Extension- M4 Feed Ramps* Weight- 2 lbs* Marked for Caliber and Twist* 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. THESE BARRELS ARE MADE SPECIFICALLY FOR NYLAUG OR SIMILAR VARIENTS, HEADSPACE IS SET CORRECTLY ALREADY AND HAVE A 20MM GAS BLOCK JOURNAL FOR FACTORY GAS BLOCK OUR THE KAK PISTON GAS BLOCK. DOES NOT FIT A FACTORY AUG.