Aero Precision 16″ Complete AR15 Magpul SL FSB Mid-Length Upper – .223/5.56

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Aero Precision 16″ Complete AR15 Magpul SL FSB Mid-Length Upper – .223/5.56

This complete upper is a great addition to any AR15 custom build. It features a standard AR15 Upper Receiver and a 16″ .223/5.56 Barrel with Pinned Front Sight Base (FSB). The Magpul MOE SL Handguard provides a comfortable and ergonomic grip, while the mid-length gas system ensures reliable operation. This upper is topped off with the tried and true A2 “Bird-Cage” Flash Hider.

Barrel and Gas System

The 16″ 5.56 Mid-Length Barrel with Pinned FSB is a high-quality component that is designed for accuracy and reliability. The mid-length gas system provides a softer recoil impulse than a carbine-length gas system, making it easier to stay on target during rapid fire.


The Magpul MOE SL Handguard is made of high-impact polymer with internal heatshields for heat mitigation after long strings of fire. Additionally, the handguard is compatible with both MOE and MLOK accessories such as rail sections, foregrips, light mounts, and more.

Please note that this complete upper DOES NOT include a Bolt Carrier Group (BCG) and Charging Handle.

Aero Precision’s Excellence Guarantee

Aero Precision is a company that prides itself on its engineering and machining expertise. With roots in the aerospace industry, they bring a level of precision and attention to detail that is unmatched in the firearms industry. Every component that they produce is held to the highest standards of quality and performance.

Investing in an Aero Precision upper is a smart choice for anyone who wants a reliable and accurate AR15 build.


  • Brand: Aero Precision
  • Model: AR15 Magpul SL FSP Mid-Length Upper
  • Caliber: .223/5.56
  • Barrel Length: 16 in
  • Thread Pitch: 1/2×28
  • Twist: 1:7
  • Color: Black and Flat Dark Earth
  • Material: 7075-T6 Aluminum and 4150 Chrome Moly Vanadium
  • Finish: QPQ corrosion-resistant finish
  • Gas System: Mid-Length
  • Weight: 4.41 lbs

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Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Aero Precision Warranty

If for any reason you have a warranty issue with one of our products, please contact us at 253-272-8188.

Please describe your situation, include your name and order number or transaction id. One of our technical specialists will then review your claim and contact you within 3-5 business days.

If you have images to send, please email them to

Damaged Items

In regards to claims dealing with damaged or blemished products, we ask that you create a Help Desk Ticket on your My Account page. If you don’t have an account with us, please go to the Contact Us page and fill out the form for review within 72 hours upon receiving the shipment.

If you have images to send, please email them to

Failed Background Check

There will be a 30% restocking fee on all lower receivers returned because of failed background checks.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.