Anderson AM 74603UP65 & B2K612Df000P Complete Upper 16" 6.5 Grendel - Precision Rifle Upgrade

The Anderson Manufacturing 16" 6.5 Grendel complete upper is built for shooters who want a precision rifle platform without assembling parts from scratch. This ready-to-run upper arrives fully assembled with everything you need to mate it to a compatible lower receiver—a genuine upgrade path for AR builders and shooters stepping into the 6.5 Grendel cartridge for intermediate-distance accuracy and moderate recoil. Whether you're upgrading an existing rifle or completing a new build, this upper delivers solid Anderson craftsmanship at a straightforward price point.

The 16-inch barrel wears a 1-in-8 twist rate, the standard for 6.5 Grendel, paired with a carbine-length gas system that balances reliability and bolt velocity without excessive carrier tilt. The muzzle is threaded 5/8-24 (standard for modern precision rifle suppressors and devices), and a standard A2 flash hider ships installed. The upper receiver is 7075 T6 forged aluminum—the same alloy used in demanding aerospace applications—ensuring dimensional consistency and durability. A simple A2-profile plastic handguard keeps your hands off the barrel, and the included standard charging handle makes operation intuitive.

The 6.5 Grendel bolt carrier group (BCG) completes the package, factory-headspaced and ready to function. This upper works with any AR-pattern lower receiver chambered for 6.5 Grendel, making it an excellent choice for builders who already have a lower on hand or plan to source one separately. The 16-inch length keeps the gun handy for hunting, tactical training, or precision rifle matches without sacrificing effective range.

Key Features

• 16-inch 6.5 Grendel barrel with 1-in-8 twist for optimized accuracy
• Carbine-length gas system for reliable cycling and moderate recoil impulse
• 5/8-24 threaded muzzle—ready for suppressors and precision muzzle devices
• 7075 T6 forged upper receiver for repeatable precision and durability
• Complete assembly with included BCG, charging handle, and A2 flash hider
• A2 handguard for heat protection and ergonomic grip
• Fully assembled and ready to pair with a compatible lower receiver

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

This upper is a standard AR-pattern component and will mate to any AR-15-style lower receiver. Since it is chambered in 6.5 Grendel, your lower should also be either 6.5 Grendel or multi-caliber. Do not assume a 5.56 or .223 lower will work; verify with your lower's specifications.

Does this upper come with a bolt carrier group?

Yes. The 6.5 Grendel BCG is included and factory-headspaced, so you won't need to source one separately.

Can I thread a suppressor onto the muzzle?

The barrel is threaded 5/8-24, which is the industry standard for modern suppressors and precision muzzle devices. A suppressor rated for 6.5 Grendel and 5/8-24 threading will mount directly once you remove or replace the A2 flash hider.

Is this upper assembled and ready to install?

Yes. The upper comes fully assembled with the barrel, BCG, handguard, charging handle, and flash hider installed. You only need to attach it to a compatible lower receiver and install your bolt catch and safety lever.