Proof Research 350 Legend AR Type Carbon Fiber Barrel

Proof Research 350 Legend AR Type Carbon Fiber Barrel is much lighter, more durable, and accurate than traditional barrels. These barrels will fit into your 350 Legend AR style rifle. Carbon fiber not only reduces barrel weight by 50% or more but also increases the overall durability. Each barrel features the patented Caliber Matched Gas System (CAMGAS) which gives you a gas system that is tuned specifically for the cartridge and length of the barrel. The result is a recoil impulse that is noticeably softer, less fouling in the receiver, increased reliability of extraction, and less wear and tear on brass. This helps keep you on target and shooting while taking advantage of the latest high performance cartridges.

Why Carbon Fiber?

Carbon fiber has long been hailed across many industries such as aerospace, cycling, alternative energy. It is recognized as a wonder material that makes everything lighter and stronger. When employed in a rifle barrel the benefits extend beyond reducing weight and increasing strength. The Proof Research patented manufacturing process begins with full profile, match grade 416R stainless steel barrel blanks that are made in our firearms division. These blanks are then turned down to a significantly reduced profile greatly reducing weight. This reduced contour barrel is then wrapped with high strength, aerospace grade carbon fiber impregnated with a proprietary matrix resin. This Resin is developed by our advanced composites division, PROOF Research ACD.

The carbon fibers that Proof Research use have a unique ability to diffuse heat along the length of the barrel, much like fiber optics transmit light. Carbon fiber also moves heat very effectively through the wall of the barrel increasing heat transport resulting in barrels that cool faster, maintain accuracy over longer sessions of fire, and live longer. The end result is an a high fiber content composite barrel that is stronger, lighter, as accurate as the finest precision steel barrel, and durable to perform in the most demanding environments. They’re not just lighter, they’re better.

Proof Research 350 Legend AR Type Carbon Fiber Barrel Features

Up to 64% lighter than traditional steel barrels of similar contour

Match grade accuracy

Improved heat dissipation for cooler and longer lasting barrels

No point of impact shift during high volume fire

Reduced harmonic barrel vibration

Unprecedented durability

Product Registration »

Proof Research 350 Legend AR Type Carbon Fiber Barrel


Type Part Number Barrel Length Twist Rate Gas System Length Gas Journal Diameter Muzzle Thread Weight
PR15 119655 16″ 16 Carbine .750 5/8-24 1lbs 12oz
PR15 119679 18″ 16 Mid .750 5/8-24 1lbs 14oz


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Additional information

Weight N/A
Barrel Length

16" 119655, 18" 119679


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