This 5.56 chambered 13.7 inch Government Profile Combat Grade barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.
5.56 NATO Chamber
4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
1/7 Twist Six Groove
1/2-28 Threaded Muzzle
.750″ Gas Block Journal
QPQ Corrosion Resistant Finish
QPQ Coated M4 Feed Ramp Extension
High Pressure (proof) Tested (HPT)
Magnetic Particle Inspected (MPI)
When pin and welded the 13.7″ barrel and Nox muzzle device will come to exactly 16.1″ without any shims or crush washers
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