What is the best barrel length for a 6.5 Grendel AR-15?

16 inch barrels offer good balance, 18 inch barrels are great for velocity and range, and 20 inch barrels are best for maximum long-range accuracy.

Are 6.5 Grendel barrels compatible with AR-15 uppers?

Yes, 6.5 Grendel barrels fit standard AR-15 upper receivers, but they require a Type 2 bolt with a .136 inch face for proper function.

What is the benefit of 6.5 Grendel over 5.56?

6.5 Grendel offers superior long-range accuracy, more retained energy, and flatter trajectories compared to 5.56 NATO.

Can I shoot 6.5 Grendel from a 5.56 upper?

No. 6.5 Grendel requires a specific barrel, bolt, and magazine, but uses a standard AR-15 upper and lower receiver.

6.5 Grendel AR-15 Barrels – 16”, 18”, 20”

Q: Are these barrels threaded?

Yes, all 6.5 Grendel barrels sold here are threaded 5/8x24 for use with muzzle brakes, flash hiders, or suppressors.

**Ballistic Advantage 18” 6.5 Grendel SPR Rifle Barrel** $232.75

**Ballistic Advantage 16" 6.5 Grendel SPR Mid-Length Barrel** $206.01

6.5 Grendel Barrels for AR-15 – Accuracy Meets Performance

When it comes to long-range precision in an AR-15 platform, 6.5 Grendel barrels are a top choice for shooters who demand performance beyond 5.56. Whether you're hunting, target shooting, or building a new upper, we carry a carefully selected range of 6.5 Grendel barrels from trusted manufacturers like Faxon Firearms and Ballistic Advantage.

Choose from 16-inch, 18-inch, and 20-inch barrels in both nitride and stainless steel finishes, threaded for standard 5/8x24 muzzle devices. These barrels are built for superior ballistic performance with flatter trajectories and better retained energy at distance — ideal for reaching past 600 yards with consistency.

All barrels are precision machined and compatible with Type 2 .136 bolt faces, giving you reliability and a tight lock-up when paired with the right bolt. Whether you're after a lightweight 6.5 Grendel barrel or a match-grade option, Mounts Plus delivers the options you need — fast shipping, competitive pricing, and USA-based support.

✅ Popular Barrel Features:

Available in 16", 18", and 20" lengths
Match-grade, chrome moly, and stainless steel options
Nitride coated for extended barrel life
5/8x24 threaded for standard muzzle devices and suppressors
Compatible with Type 2 bolts (.136” face depth)

Looking to complete your 6.5 Grendel AR-15 build? Pair your new barrel with one of our AR-15 bolt carrier groups and a matching Type 2 6.5 Grendel bolt for perfect headspacing and reliable cycling.

Need a receiver upgrade? Check out our selection of AR-15 upper receivers designed to handle long-range loads. You can also explore AR-15 barrels in other calibers or shop all AR-15 parts to finish your build.

We proudly carry premium Faxon Firearms barrels and parts, trusted for quality, precision machining, and USA-made performance.

❓ Frequently Asked Questions

Q: What is the best length for a 6.5 Grendel barrel?
A: It depends on your application. 16" barrels are great for maneuverability, 18" offers a balance of range and weight, and 20" provides maximum velocity and accuracy for long-range shooting.

Q: What is a Type 2 bolt face, and do I need it?
A: Most modern 6.5 Grendel barrels use a Type 2 bolt face (.136" depth). It ensures proper headspacing and reliability. Yes — you should pair your barrel with a Type 2 bolt.

Q: Are these barrels threaded?
A: Yes, most 6.5 Grendel barrels listed are 5/8x24 threaded, compatible with common muzzle devices and suppressors.

Q: What twist rate is best for 6.5 Grendel?
A: Most barrels use a 1:8 twist rate, which stabilizes 120–130 grain bullets commonly used in 6.5 Grendel loads.

Q: Can I use these barrels on my existing AR-15 upper?
A: Yes, as long as your upper receiver and bolt carrier group are compatible with 6.5 Grendel and your bolt matches the Type 2 spec.