Geissele Automatics Rifle Barrel Features The Geissele Automatics Rifle Barrel is precision machined and cold hammer forged from chrome moly vanadium steel at Geissele s state-of-the-art facility a process chosen for the consistency and durability it delivers over less rigorous manufacturing methods. The Geissele taper profile balances weight savings with barrel stiffness helping keep the rifle well balanced without sacrificing accuracy. A mid-length gas system paired with a .750 gas block diameter and .081 gas port is tuned for reliable cycling across a range of 5.56 NATO loads. M4 feed ramps are machined into the barrel extension to further improve feeding reliability in AR-15 pattern rifles. Every Geissele barrel is High Pressure Tested and Magnetic Particle Inspected two quality control steps that help catch defects before the barrel ever reaches a customer s rifle. The 13.9-inch length pairs with a 1-7 twist rate suited to a wide range of 5.56 bullet weights and the manganese phosphate finish provides a durable corrosion-resistant exterior. This combination of rigorous testing and premium materials makes the barrel a strong choice for duty use competition or any application where accuracy and reliability both matter. The Geissele Automatics Rifle Barrel is available for sale at GrabAGun for AR-15 builders who want proven reliability from a respected manufacturer. Geissele Automatics Rifle Barrel Specifications Manufacturer: Geissele Automatics Model: Rifle Barrel Compatible Hosts: AR-15 Caliber: 5.56 Barrel Length: 13.9 Barrel Type: Cold Hammer Forged Color: Black Finish: Manganese Phosphate Thread Pitch: 1/2x28 Gas System: Mid-Length Available At: GrabAGun