Geissele Automatics AR-15 Barrel Features The Geissele Automatics barrel is cold hammer forged from chrome moly vanadium steel and cut to the Geissele Taper Profile balancing weight and rigidity for a 10.3 AR-15 build. A 1 in 7 twist rate stabilizes a wide range of 5.56 bullet weights giving the shooter flexibility in ammunition selection without sacrificing accuracy. The chrome lined bore resists corrosion and heat erosion from sustained fire extending the barrel s service life under hard use. M4 feed ramps are machined in for reliable feeding from a variety of magazines and bolt carrier groups. A carbine length gas system paired with a .750 gas block diameter and a .075 gas port tunes gas pressure for dependable cycling in a short barrel configuration. The 1/2x28 threaded muzzle accepts standard 5.56 muzzle devices and suppressors giving the builder flexibility for a compensator flash hider or suppressor mount. Every Geissele barrel is High Pressure Tested and Magnetic Particle Inspected at their North Wales Pennsylvania facility to confirm consistency and catch defects before the barrel ships. Finished in manganese phosphate for corrosion resistance this barrel suits a hard use duty weapon a precision tuned competition gun and everything in between. Geissele Automatics AR-15 Barrel Specifications Manufacturer: Geissele Automatics Model: Rifle Barrel Compatible Hosts: AR-15 Caliber: 5.56 Barrel Length: 10.3 Barrel Description: Cold Hammer Forged Geissele Taper Profile Chrome Lined Gas System: Carbine Length Twist Rate: 1:7 Muzzle Thread Pitch: 1/2x28 Finish: Manganese Phosphate Color: Black Available At: GrabAGun