6MM

Proof Research's barrels exemplifies relentless pursuit of excellence. Whatever your preference is, you can expect the finest rifle barrel in the industry.The Carbon Fiber barrel features a full-profile, match-grade 416R stainless steel barrel blanks...

Proof Research 16" Carbon Fiber 22 ARC Barrel - Rifle-Length Gas Step into the future of AR performance with the Proof Research 16″ 22 ARC Carbon Fiber Barrel. Engineered for shooters who demand match-grade accuracy, reduced recoil, and extreme...

Noveske 12.5" 416R Stainless 6mm ARC Barrelwith Lo-Pro Gas Block & Headspaced Bolt - Mid-Length Gas Engineered for shooters who demand uncompromising performance, the Noveske 12.5" Leonidas Stainless Lo-Pro Gas Block Barrel in 6mm ARC is a...

This 18” 6MM ARC barrel is machined from 416 Stainless Steel with a QPQ finish. Our Premium Black Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension.

Proof Research's barrels exemplifies relentless pursuit of excellence. Whatever your preference is, you can expect the finest rifle barrel in the industry.The Carbon Fiber barrel features a full-profile, match-grade 416R stainless steel barrel blanks...