Luth-AR Releases New Fractional Twist AR Barrels

Buffalo, Minnesota-based Luth-AR has announced the addition of the 1:8.5 Twist Barrel to its lineup of Fractional Barrels. This category breaks from the norm to make barrels with whole-number twist rates versus fractional twist rates. For the AR market, barrels have been primarily offered with 1:7, 1:8, 1:9, 1:12 twist rates.

For nearly 60 years there hasn’t been much change, and as the company explained in a blog post on its website, “The AR market typically expects that the heavier bullets such as 75, 77, 80-grain bullets shoot more accurately in a 1:7 or 1:8 twist barrel. Conversely, the 1:9 twist has been considered the standard for the recreational shooting of the 55, 60, 62, 68, and 69-grain bullets.”

Luth-AR 1-8 1/2 Twist Barrels
The 1-8 1/2 Fractional Twist AR Barrel may offer a more inclusive accuracy bandwidth for 55 to 77-grain bullets.

The post went on to explain the versatility of the 1:8.5 Twist, suggesting it strikes a balance between stability and versatility,” and that a  1:8.5 Fractional Twist AR Barrel could offer a more inclusive accuracy bandwidth for 55 to 77-grain bullets.

“The 1:8.5 twist rate strikes a balance between stability and versatility. Unlike barrels with slower twist rates that excel with lighter projectiles or faster twists ideal for heavier bullets, the 1:8.5 twist offers a sweet spot that accommodates a wide range of bullet weights,” the post added. “This versatility makes it a favorite among precision shooters who require adaptability in various shooting scenarios, whether it’s target shooting, hunting, or long-range competitions, or even the lack of ammo availability.”

Luth-AR further noted that other fractional twist barrels have been made from a custom standpoint but not from a production cycle at affordable prices. The new line of 1:8.5 Twist AR Barrels is meant to address that fact with three offerings including a 20-inch Heavy Barrel button broached in 416 SST; a 20-inch Fluted Threaded Bull Barrel, button broached in 416 SST; and a 20-inch Non-Fluted Threaded Bull Barrel, button broached in 416 SST.

Each has a 1/2×28 thread pitch, with a .936 gas block diameter, six lands and grooves, and an M4 feed ramp. The three barrels are available now for $244.95 MSRP for the 20-inch Fluted Bull Barrel, while the 20-inch Bull Barrel and Heavy Barrel Threaded versions each have an MSRP of $229.95.

Peter Suciu is a Michigan-based freelance writer who regularly covers firearms related topics and military history. As a reporter, his work has appeared in dozens of magazines, newspapers, and websites. Among those are The National Interest, Forbes, and many others. He has collected military small arms and military helmets most of his life, and just recently navigated his first NFA transfer to buy his first machine gun. He is co-author of the book A Gallery of Military Headdress, which was published in February 2019. It is his third book on the topic of military hats and helmets.

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