Description
The Proof Research AR-Style is a rifle barrel in 6mm ARC, 20" long.
The rifling twist is 1:7.5 – one full turn of the bullet in 7.5 inches of barrel. Twist rate decides which bullet weights a barrel can stabilise: a faster twist (a smaller number) handles longer, heavier bullets, a slower one suits lighter ones. It is cut into the barrel and cannot be changed.
It is chambered in 6mm ARC. Chamber and bore have to match the ammunition exactly – a barrel is not adaptable to another cartridge.
Fitting a barrel is gunsmithing on most actions: headspace has to be checked with gauges after installation. An AR-pattern barrel is the usual exception, being a drop-in against a correct bolt.
This is a part or accessory, not a firearm, and ships directly to your address.
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