Centurion Arms, 11.5in FBI , Hammer Forged Barrel, Carbine, .750 Gas Journal w/alignment notch for use with our TABBED gas blocks (non-tabbed gas blocks will still work.)
In-house pinned gas block is a
tabbed, "ultra low profile" , pin-only, gas block with no need for set
screws, and has no threaded holes for them. We now use a heavy duty,
double coiled spring pin which can be driven in/out in either direction,
instead of the old taper pin.
Cold Hammer Forged Barrels
Hammer forging is a process in which a
drilled, reamed and honed blank has the rifling formed into it by
placing the barrel blank on a mandrel that has the rifling ground into
its outer surface. The blank and mandrel are then placed between two
opposing power hammers and the blank is beaten around the mandrel
leaving the rifling pattern in the barrel. This process leaves an
extremely smooth and consistent surface on the inside of the barrel,
that lends itself to excellent accuracy. The forging process also work
hardens the barrel steel causing a very durable and much longer lasting
barrel. Our barrels have a slight taper to the bore during the hammer
forging process to ensure better accuracy. Our hammer forged barrels are
the best choice for shorter range, combat shooting style and high round
counts.
Chrome lined chamber and bore
The hard chrome used to coat the
chamber and bore are harder than the barrel steel itself. This aids in
longevity and also reduces fouling and corrosion often seen in austere
field conditions. Chrome also aids in chambering, extraction, and
overall reliability of the weapon. Thus, giving the operator a more
reliable weapon with less maintenance. We have our chrome lining applied
to twice the thickness of standard small arms barrels.
Barrel steel
The steel used in our hammer forged
barrels was specifically developed as machine gun barrel steel to help
increase the barrel life under prolonged rigorous firing schedules.
Twist rate
We use a 1/7 (1 turn in 7 inches)
twist rate in all our barrels. This is the best overall twist rate for
this weapons system. The 1/7 twist will stabilize any of the light
weight 5.56 bullets as well as any other twist. This twist will also
stabilize the newer heavier bullets that are being used allowing the
operator to get the best performance out of this weapon system.
Chamber
We use a true 5.56 chamber in our
barrels allowing the operator the ability to use the higher pressure
military ammunition on the market and helping to enhance reliability.
Feed ramps
Our barrels are supplied with extended M4 style feed ramps to enhance overall feeding and weapons reliability.
Finish
The barrel finish we use is a
manganese phosphate finish (Mil-Spec A-A-59267). This finish allows for
better absorption of oils to help prevent corrosion. These barrels are
all finished prior to any gas blocks being mounted to ensure the entire
surface is covered to maximum protection even under the gas block.
HPT/MP inspected
HPT(high pressure test) is a process
where a proof load rated at 70,000 psi, far exceeding a normal round, is
fired trough the barrel then the barrel is MPI (Magnetic Particle
Inspected) to detect any flaws in the barrel steel from the proof load.
These are standard quality assurance tests performed on all our hammer
forged barrels to ensure the highest quality product.
