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Proof Research PR15 18″ 6.5 Grendel Rifle Length 1/8 Twist AR 15 Carbon Fiber Barrel


3 in stock


We have designed our AR barrels with the goal of improving performance and reliability in the AR platform. Our Caliber Matched Gas System (CAMGAS) results in a gas system that is tuned specifically for the cartridge and length of the barrel. The AR-15 Platform was originally designed around the 223REM and 5.56NATO cartridges and the AR-10 was designed around the 308 Win/7.62NATO round. With higher performance cartridges such as the 22 Nosler and 6.5 Creedmoor, the bore pressure remains higher further down the barrel. By moving the port location, we ensure that the gas system pressure is the same as what the AR platforms were originally designed around. 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.

  • Lightweight Up to 64% lighter than traditional steel barrels of similar contour.
  • Extreme Temperature Resistance Improved heat dissipation for cooler and longer lasting barrels.
  • Unprecedented durability Wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin.

Additional Info

Length – 18″

Material – 416R Stainless Steel

Profile – Medium

Finish – Stainless Steel Carbon Fiber Wrapped

Gas System Length – Rifle

Gas Block Journal – .750″

Twist Rate – 1:8 inches

Muzzle – 5/8×24 Threaded

Weight – 1lbs 13oz

PORT SIZE – .099

Other Info – HP and MPI Tested

Other Info – Grendel type 2 chamberRecommended components:

Full Mass Bolt Carrier Group
Full Mass Buffer
Adjustable Gas Block

* All barrels with Intermediate, Rifle +1, Rifle +2, and Rifle +3 gas systems include the proper gas tube.

* Our AR-10 barrels use a deep feed system that makes the feed ramps compatible with the feed ramps in the lower receivers of both DPMS and Armalite style rifles.

* It is recommended to double check and ensure proper headspace before firing your rifle.


Additional information

Weight 2.5 lbs
Dimensions 20 × 2 × 2 in


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