Luth-AR Launches A New Versatile .308 Fluted Bull Barrel Complete Upper

Luke C.
by Luke C.

Luth-AR, a manufacturer of rifle components and accessories, has announced the release of its new . 308 24″ Fluted Bull Barrel Complete Upper. The upper is designed to deliver exceptional performance and reliability for a range of applications, including hunting, competition, and tactical shooting. The upper features a threaded barrel made from 4150 Chrome Moly steel, with a 1:10 twist rate and a flash hider installed. The upper is also equipped with a 15″ .308 Widebody Hand Guard, which provides M-LOK attachment points and a Picatinny top rail.

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Luth-AR Launches A New Versatile .308 Fluted Bull Barrel Complete Upper

Luth-AR is excited to introduce the latest addition to its product lineup, the .308 24″ Fluted Bull Barrel Complete Upper. Built to deliver exceptional performance and reliability, this complete upper is made from high-quality 4150 Chrome Moly and features a 1-10 twist, threaded barrel with flash hider. The 15″ .308 Widebody Hand Guard™ is equipped with M-LOK® attachment points and Picatinny top rail, providing shooters with endless customization options. The .308 A3 upper receiver, bolt carrier, bolt, and charging handle are included, making this an easy drop-in upgrade for any compatible rifle. Whether you’re a hunter, competitor, or tactical shooter, the Luth-AR .308 24″ Fluted Bull Barrel Complete Upper is the perfect choice for your next build.

Specifications:Upper Receiver:
  • A3 Upper receiver
  • Charging handle
  • Ejection port door installed
  • Hard Coat Anodized Black
  • 6061-T6 Aluminum Extrusion
  • .275 Takedown pin holes
  • 1913 Picatinny Rail is .151″ low profile
  • DPMS (Gen1) A3 low receiver height
Bolt Carrier Specs:
  • Carrier: 8620 steel
  • Cam pin: 4340 Alloy steel
  • Carrier key: 4130 Alloy steel
  • Army Spec Heat Treatment
  • Manganese Phosphate
  • Due to supply chain issues, material for the bolt may vary.
  • Mil-Spec heat treat
  • Manganese Phosphate
  • 4140 Chrome Moly
  • Machined from bar-stock
  • Mil-Spec heat treat
  • Manganese Phosphate
  • Caliber: .308
  • Twist: 1-10
  • Type: Fluted Bull Barrel, Threaded
  • Length: 24″
  • Material: Chrome Moly Vanadium (4150 steel)
  • Finish: Manganese Phosphate
Flash Hider:
  • Thread Pitch: 5/8 – 24
  • 4140 Chrome Moly
  • Finish: Manganese Phosphate
  • .308 Widebody Hand Guard™
  • M-LOK®
  • 15” Length available
  • Includes Widebody Hand Guard® Barrel Nut
  • Includes 4 clamp screws
  • 2 vertical set screws, to control linear movement
  • Thread lock for simple and quick installation
  • Material:6061-T6 Aluminum extrusion
  • Finish: Black hardcoat anodized, matte finish
  • Dimensions

    Height: 2.00″Width at widest part: 2.26″Inside Height: 1.625″Inside Width: 1.35″

Luth-AR Launches A New Versatile .308 Fluted Bull Barrel Complete Upper

Based on the specifications and features this upper seems like it should deliver exceptional performance and reliability for a range of shooting applications. The high-quality materials and construction, along with the wide range of customization options, make it an attractive option for shooters looking to upgrade their rifles. With the Luth-AR brand’s reputation for quality and innovation, it’s expected that this product will perform well in the market and meet the needs of hunters, competitors, and tactical shooters. The Luth-AR .308 24″ Fluted Bull Barrel Complete Upper is now available for purchase at, with a manufacturer’s suggested retail price of $674.95. For more information on Luth-AR and its products, visit

Luke C.
Luke C.

Reloader SCSA Competitor Certified Pilot Currently able to pass himself off as the second cousin twice removed of Joe Flanigan. Instagram:

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5 of 9 comments
  • Keiichi Keiichi on May 13, 2023

    I’m honestly surprised that they chose .308 over one of the more modern competition rounds in the 6-6.5 mm space.

    Always thought LuthAR focused on the long range niche.

    • See 1 previous
    • Keiichi Keiichi on May 13, 2023

      @Andrew Nah LuthAR for sure is what I’m thinking of. I have one of their stocks on a rifle. I guess I was mistaken.

  • Now call me dumb if you want to, but what's the purpose of a fluted bull-barrel? Aren't those two features overlapping? It would be like a lightened tungsten magwell. Wouldn't it be cheaper and give you the same effect if you just ran a slimmer barrel profile, or is the idea to create a larger surface to "pull" (I don't remember the technical term) more heat, while retaining stiffness? It seems like a whole lot of work to be honest.

    • Beju Beju on May 23, 2023

      @Theo Crabalar 🏹📷 Investigator, A heavy bull barrel gives you more stiffness to reduce barrel whip, and more heat capacity. Before modern stress relieving methods, that would delay/reduce zero shift. Even with modern manufacturing reducing/eliminating heat related zero shift, it means that groups won't open up as quickly as a lighter profile barrel.

      The fluting reduces weight while still retaining a more stiffness than a thinner profile barrel.

      It is reducing mass, which can reduce heat capacity, but theoretically, some of that is compensated for by having more surface area to shed heat from.