This Alexander Arms 6.5 Grendel 11.5-inch barrel (brand part no. B65SBR11) is a button-rifled 416R stainless steel barrel built as the starting point for a 6.5 Grendel SBR or pistol build, matching the exact specifications of Alexander Arms’ own 11.5-inch upper receiver assembly.

Key Specifications

• Chambered in 6.5 Grendel.
• Barrel length of 11.5 inches.
• Button-rifled 416R stainless steel construction.
• 1:8 twist rate.
• 5/8-24 TPI right-hand muzzle threading with a 60-degree muzzle crown.
• Barrel extension pre-installed.
• Gas port positioned for a carbine-length gas system.
• Matches the spec of Alexander Arms’ own 11.5-inch upper receiver assembly.
• Fully inspected and prepared for AR-15 platform assembly.
• Barrel weight of 1.36 pounds, gas block diameter 0.875 inches.

Frequently Asked Questions

Can I put this on any AR-15 lower? Since this is a bare 11.5-inch barrel under the 16-inch federal rifle minimum with no lower receiver included, federal Short-Barreled Rifle rules only come into play once it’s assembled onto a complete, shouldered rifle. Installing it on an unregistered rifle configuration without a prior approved ATF Form 1 would create an illegal SBR, so confirm your build’s configuration and registration status before assembly.

What gas system does this barrel use? The gas port is positioned for a carbine-length gas system, matched to this 11.5-inch length.

Does it match Alexander Arms’ factory upper? Yes, Alexander Arms builds it to the same spec as their own 6.5 Grendel 11.5-inch upper receiver assembly.

Buy the Alexander Arms 6.5 Grendel 11.5in Barrel

Order it from our Alexander Arms lineup, browsable in our full AR barrels selection, and we will get it moving from our Lubbock, TX gun shop as soon as it is ready to ship.