Luth-AR has a range of new upper receivers featuring their Fractional Twist barrels. These new uppers have 20-inch barrels with a 1-8 1/2 twist rate. This specialized twist rate is stated to be ideal for a wide range of bullet weights.

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Barrel twist rates should be matched to an appropriate bullet weight. Common options on the AR-15 are 1-7 (meaning the bullet makes one revolution in 7 inches of barrel length), 1-8, and 1-9. Faster twists work best with heavy bullets but may cause problems with lighter bullets. Luth-AR wanted to provide a solution that works well with everything from 55-grain to 77-grain projectiles, and the 1-8.5 twist rate was the answer.

Luth-AR has several complete upper options with the 1-8 1/2 Fractional Twist rate. All feature 20-inch 416 stainless steel barrels with bull or heavy contours. Both KeyMod and M-LOK handguards are available. Prices range from $504.95 to $519.95 depending on options. They are available now directly from Luth-AR.

From the manufacturer:

Following our introduction of the 1-8 1/2 Fractional Twist™ barrels, we are now thrilled to announce the availability of 1-8 1/2 Fractional Twist™ Complete Uppers, featuring either MLOK® or Keymod 15″ Palm Handguard®.

Embrace the Fractional Twist!

We are adding three new complete uppers to our line-up using our new 20″ 1-8 1/2 Fractional Twist™ Barrels:

• 20″ Heavy Barrel Complete Upper Assembly
• 20″ Fluted Threaded Bull Barrel Complete Upper Assembly
• 20” Non-Fluted Threaded Bull Barrel Complete Upper Assembly

The new 1-8 1/2 Fractional Twist™ Complete upper receiver assemblies are the perfect choice for precision shooting with a wide variety of ammunition.

Each barrel profile adds strength for stability, reducing recoil and increasing accuracy. The barrels are made of high-quality stainless steel, providing durability and longevity. The 1-8 1/2 twist rate is suitable for stabilizing a wide variety of projectiles. This is an excellent option for shooters who want a barrel they can use with a range of bullet weights with precision shooting in mind.

All images from Luth-AR