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Questions & Answers
Does this come with a gas block and tube? Manufacturer Answer

None of our barrels will come with a gas block. Any of the 300 blackout barrels are standard gas lengths and will not have a gas tube either. You will need to buy both separately. We do recommend the use of a gas block with the 2 set screws on the bottom as our barrels will come with a dimple in the barrel to make gas block alignment a breeze.

by Proof Research, Manufacturer, February 6, 2025
Is there a 9 inch carbon fiber 300aac black out available or can the 16 inch be cut down and rethreaded? Manufacturer Answer

We do not offer a 9" 300BLK barrel. The shortest length we currently offer is 12.5" and the barrels cannot be cut down and re threaded.

by Proof Research, Manufacturer, June 29, 2022

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Color:
Black/Silver
Caliber:
.300 AAC Blackout
Barrel Length:
16 in
Barrel Profile:
Contour 0.75GB
Gas System Length:
Carbine Length
Gas Block Journal Size-Diameter:
.750 in
Barrel Twist Rate:
1-8
Flutes:
No
Gun Make:
AR Platform
Gun Model:
AR-15
Weight:
1.5 lb
Gun Type:
Rifle
Firearms Threads Per Inch:
5/8x24

Code: 2SB-ATB-PR15CFA-100561

MPN: 100561

UPC: 843068100561

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List: $1,149.00Save 13%
$999.00

Product Info for Proof Research PR15 Carbon Fiber .300 AAC Blackout Rifle Barrel

Put some pep in your step and improve your accuracy with a Proof Research PR15 Carbon Fiber 300AAC Rifle Barrel. These Rifle Barrels by Proof Research feature a lightweight design that ensures you can still take down targets while reducing your weapon weight. Unlike many traditional barrels, this Proof Research PR15 Carbon Fiber .300 AAC Barrel has a unique manufacturing process that creates a stronger and more rigid barrel. Boost your weight reduction and improve your shot performance at the range when you slap on this Proof Research PR15 Carbon Fiber .300 AAC Barrel.image

Manufacture Specifications of Proof Research PR15 Carbon Fiber 300AAC Rifle Barrel: 

  • Barrel Type: PR15 
  • Length: 16" 
  • Chamber/Caliber: 300 Blackout
  • Twist Rate: 8
  • Gas System Length: Carbine
  • Gas Journal Diameter: .750 
  • Muzzle Threading: 5/8x24
  • Material: Carbon Fiber

Features of Proof Research PR15 Carbon Fiber 300AAC Rifle Barrel:

  • Excellent erosion wears characteristics and corrosion resistance.
  • An optimum combination of high tensile strength and requisite toughness to withstand extreme chamber pressures encountered during firing.

Package Contents:

  • Proof Research PR15 Carbon Fiber 300AAC Rifle Barrel

Proof Research PR15 Carbon Fiber .300 AAC Blackout Rifle Barrel Orderable Models

List of Orderable Models

  • Proof Research PR15 Carbon Fiber 16in 300AAC Carbine Rifle Barrel, 300cal, 0.75GB, 8 Twist, 5/8 x 24, 100561 , MPN: 100561 , UPC: 843068100561 , Code: 2SB-ATB-PR15CFA-100561

Proof Research PR15 Carbon Fiber .300 AAC Blackout Rifle Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • Proof Research PR15 Carbon Fiber 16in 300AAC Carbine Rifle Barrel, 300cal, 0.75GB, 8 Twist, 5/8 x 24 w/ Luth-AR A3 Assembled Upper Receiver , Code: 2SB-ATB-PR15CFA-100561-KIT1
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Last updated 2026-07-07 UTC.