FN 5.56/.223 Rifle Upper – 20 Inch

If you’re building an AR-15 or need a reliable upper for a dedicated .223/5.56 rifle, this FN upper receiver assembly is a solid choice. These are built in FN’s South Carolina facility – the same facility producing rifles for US military contracts. That means you’re getting quality control and attention to detail that’s hard to beat.

This is a complete upper, meaning it comes with the barrel, bolt carrier group, and charging handle. It’s meant to be paired with a separate lower receiver to complete the rifle. We see a lot of folks around Anchorage using these for varmint hunting, practicing at the range, or building a lightweight rifle for back country trips. The 20-inch barrel offers a good balance of velocity and maneuverability. It works well with a variety of optics.

FN 5.56/.223 Upper Receiver Specs:

• Barrel Length: 20 inches
• Caliber: 5.56 NATO / .223 Remington
• Barrel Profile: M16-style
• Gas System: Rifle-length
• Handguard: Two-piece, single heat shield, oval design
• Front Sight: A2 front sight post
• Bolt: Carpenter 158 steel, Magnetic Particle Inspected (MPI)
• Bolt Carrier: M16-style, properly staked gas key
• Charging Handle: Standard AR-15 charging handle

The rifle-length gas system is a common choice for ARs and offers a smooth shooting experience. The M16-style barrel profile is a durable and proven design. The included MPI bolt ensures a high level of reliability, critical when you’re relying on your rifle in the field. We stock these because Alaskans need gear they can depend on.

Building an AR-15? Don’t forget you’ll also need a lower receiver, buffer tube assembly, grip, and stock to complete your rifle. We carry those parts separately as well.

Concealed Carry/Home Defense Note: While this upper can obviously be used on a complete rifle for these purposes, remember that a 20” barrel isn’t ideal for close-quarters work. Consider a shorter barrel length for dedicated CQB builds.

Shipping & FFL Transfers: All firearms and firearm parts are shipped to a licensed Federal Firearms Dealer (FFL). We ship to FFLs throughout Alaska. You are responsible for arranging the transfer with your local FFL. After you place your order, we will contact you for FFL information. Please be sure your FFL will accept shipments from an Alaska retailer.