Geissele CHF 5.56mm Barrel 14.5 in Chrome Lined1/2x28 1-7 Twist Mid Length Tapered. Our barrels are High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI). The accuracy and reliability of Geissele CHF barrels makes them an ideal choice for a hard use duty weapon precision tuned competition gun and everything in between. Specifications for Geissele Chrome Lined 5.56mm Threaded AR Barrel: Manufacturer: Geissele Gas Block Journal Size-Diameter: .750 in Package Contents: Geissele CHF AR-15 5.56mm Threaded Barrel What firearm models does the manufacturer say Geissele Chrome Lined 5.56mm Threaded AR Barrel is compatible with? The manufacturer suggests that Geissele Chrome Lined 5.56mm Threaded AR Barrel is compatible with AR-15Geissele 05-3281: CHF 5.56mm Barrel 14.5 in Chrome Lined1/2x28 1-7 Twist Mid Length Tapered