Spikes Tactical Barrel 5.56 NATO 16" 1:7 Twist Fits AR Rifles 1/2x28 TPI Thread Carbine Black Finish SB51605-M4

Spike's Tactical Barrel 556Nato 16" Black 1:7 1/2X28 TPI Thread AR Rifles Sb51605-M4
Barrel Steel is Certified MIL-B-11595E Chromoly Vanadium Alloy and Magnetic Particle Inspected they are also stress relieved.

Features
Mil-Spec M4 Barrel Extension with 5.3.1.2 MIL-STD-171 Phosphate Finish
1.2.2.2 MIL-STD-171 Hard Chrome Chamber
1.2.2.2 MIL-STD-171 Hard Chrome Bore
1/7 Twist Rate
5.56mm Nato chamber
All Chambers are Individually Checked for Head Spacing Before and After Plating
All Barrels are Individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI)
5.3.1.2 MIL-STD-171 Phosphate Finish on the Barrel Exterior
1/2x28 Thread Pitch
Threads are Cut Concentric to the Bore
Uses 0.750" Gas Block
Weight is 27.9oz