M4 Feed Ramp Barrel Extension
Mil-Spec M4 feed ramp modifications were performed to enhance the reliability of the shorter 16" barreled carbines.
1/7 Twist Rate
This twist rate has proven very versatile and can effectively run the full range of 5.56/.223 ammo including new heavier 5.56 ammo that is hugely popular with military and private security personal for its’ superior ballistics.
Mil-Spec Barrel Steel (Mil-B-11595E)
This grade (CMV) 4150 chrome-molly vanadium steel; it is stronger and will last longer than the typical barrels offered in the commercial market. The Mil-Spec grade steel gets its’ additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. This will offer increased barrel life and performance through use in all types of extreme environments and temperatures.
Manganese Phosphate Barrel Finish (Mil-Spec A-A-59267)
Barrels are manganese phosphate finished. Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements.
5.56 NATO Chambers
The 5.56 NATO chamber is the best choice for effective deployment, reliability, and compatibility, of higher chamber pressures of military ammo. The 5.56 chamber will accept 5.56 or .223 ammo.
M4 Government Barrel Profile
The M4 government profile barrel is compatible with the current M203 mounting systems.
HPT / MP Inspected Barrels (Mil-Spec ASTME1444-01)
Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures; the M197 HPT is rated for 70,000 psi. MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. The barrels are MP inspected with both circular and longitudinal magnetic fields.
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AR-15 PARTS AND SUPPLIES