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Questions & Answers
Does this item come with the appropriate length gas tube? Expert Answer

All barrels with Intermediate, Rifle +1, Rifle +2, and Rifle +3 gas systems include the proper gas tube. Any other standard length barrel will use a standard length gas tube (carbine, midlength, etc.)

by Armando R., Gear Expert, March 22, 2022
WHAT THREAD SIZE TO ADD SUPPRESOR Manufacturer Answer

All 6ARC barrels from Proof will come threaded 5/8-24 as a standard.

by Proof Research, Manufacturer, May 29, 2025
Customer Reviews
Helpful Positive Review 6mm Arc Proof Research by JG, Verified Owner, April 6, 2024
Great product at a great price. Would recommend. Quick shipping as long as they don't use DHL
3/3 found this helpful
Helpful Positive Review Awesome barrel! by Michael Oxlong, Verified Owner, October 24, 2022
This is my 4th Proof Research carbon fiber barrel, and also my new favorite. Super super light, looks great, and is one of the main contributing reasons to my being able to build a .46moa AR-15. Combined with a Lancer carbon fiber handguard, the gun ...
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6/6 found this helpful
Helpful Positive Review 6mm arc pr15 barrels by Quentin Clayton, March 17, 2024
Josh needs to learn how to hand load and the 6mm arc with cycle fine I own 3 and have hand loaded for years and if u size the case properly it will cycle sorry Josh u need reloading 101
8/8 found this helpful
Helpful Negative Review 18 inch PROOF RESEARCH barrel 6MM ARC by JOSH, Verified Owner, January 5, 2024
Buyers. Beware this barrel is only tune for factory loads which is only three rounds the 103s the 105s in the 108 Hornadys . You cannot make reload with this barrel. It will not function. PROOF RESEARCH is aware of this and they do not care.
2/29 found this helpful
Read All 4 Reviews
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Product Info for Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel

Properly prepare yourself for the most intense shooting sessions when you upgrade your rifle with a Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel. With a lightweight design that provides an optimal weight savings, these AR15 Barrel by Proof Research are much more durable than their steel predecessors and deliver softer recoil - boosting your performance in the field, backcountry or at the range. The high heat resistance of the aerospace-grade carbon fiber wrap inside the Proof Research PR15 6mm ARC Threaded Barrel ensures that your barrel doesn't overheat and delivers the durability you need to create powerful weapon modifications. A high temperature resistance also allows this barrel to work efficiently in hot or colder environments, ensuring that you're using the Proof Research PR15 Carbon Fiber Barrel with ease.image

Specifications for Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel:

Manufacturer: Proof Research
Color: Graphite/Sliver
Fabric/Material: Carbon Fiber
Caliber: 6mm ARC
Barrel Profile: Standard
Gas Block Journal Size-Diameter: .750 in
Threads per Inch: 5/8x24
Barrel Twist Rate: 1-7.5
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Condition: New
Gas System Type: Direct Impingement

Features of Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel

  • 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
  • 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.

Package Contents:

  • Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel

Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel Orderable Models

List of Orderable Models

Proof Research PR15 Carbon Fiber Barrel, 6mm ARC, 18 in, Rifle+1 Length, 5/8x24 Thread, 1-7.5 Twist, 4 Groove, Carbon Fiber, 128671 , MPN: 128671 , UPC: 843068128671 , Code: 2SB-ATB-CFB6ARC-128671
Proof Research PR15 Carbon Fiber Barrel, 6mm ARC, 16 in, Rifle Length, 5/8x24 Thread, 1-7.5 Twist, 4 Groove, Carbon Fiber, 128657 , MPN: 128657 , UPC: 843068128657 , Code: 2SB-ATB-CFB6ARC-128657
Proof Research PR15 Carbon Fiber Threaded Barrel, 6mm ARC, 20in, Rifle+1 Length, 1-7.5 Twist, 5/8-24 Thread, Standart, 4 Groove, 130438 , MPN: 130438 , UPC: 843068130438 , Code: 2SB-ATB-CFB6ARC-130438
Proof Research PR15 Carbon Fiber Threaded Barrel, 6mm ARC, 14.5in, Intermediate Length, 1-7.5 Twist, 5/8-24 Thread, Standart, 4 Groove, 130421 , MPN: 130421 , UPC: 843068130421 , Code: 2SB-ATB-CFB6ARC-130421

Proof Research PR15 6mm ARC Carbon Fiber Threaded Barrel Unavailable & Discontinued Models

List of Unorderable Models

DEMO, Proof Research PR15 Carbon Fiber Barrel, 6mm ARC, 18 in, Rifle+1 Length, 5/8x24 Thread, 1-7.5 Twist, 4 Groove, Carbon Fiber, 128671 , MPN: 128671-DEMO , Code: 2SB-ATB-CFB6ARC-128671-DEMO
DEMO, Proof Research PR15 Carbon Fiber Barrel, 6mm ARC, 16 in, Rifle Length, 5/8x24 Thread, 1-7.5 Twist, 4 Groove, Carbon Fiber, 128657 , MPN: 128657-DEMO , Code: 2SB-ATB-CFB6ARC-128657-DEMO
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