APF M4 5.56 NATO Complete AR-15 Upper Receiver, 16" Barrel

The M4 Complete Upper from Alex Pro Firearms® is a superbly crafted Upper that will serve well as the foundation of your next AR build. It's built around a .5.56 NATO chamber and features a 4140 steel barrel with 1:9" twist. The 1:9" twist excels with popular and widely available 55- and 62-grain bulk rounds, so it's cheaper to own.

The M4 Upper also comes outfitted with an M4-style polymer handguard and rail-height gas block, so it accommodates flip-up sights, no problem. Forward assist and dust cover come standard, and the Upper includes a nitrided bolt carrier group and charging handle, so it's ready to pin to a lower of your choice. And best of all? It's a fantastic value. Comparable uppers of this quality currently sell for at least twice the price. So don't wait. This is your chance to get a boutique-quality AR Upper at an entry-level price.

More on Alex Pro Firearms

Alex Pro is a Minnesota company headquartered in Alexandria—just about two hours north of us here at The Guide. Having been in the machining business for over 30 years, APF manufactures the majority of their own firearm components in-house. This allows them to deliver a high-quality product at a fair price. With a passion for firearms and extensive knowledge of premier manufacturing methods, they're continually striving to build the highest quality guns on the market.

• Chambered for 5.56 NATO
• 16" 4140 steel barrel
• 1:9" twist offers greater accuracy with inexpensive 55- and 62-gr. bulk rounds, as well as lighter varmint loads
• 7075-T6 forged upper
• Carbine-length gas system
• M4-style polymer handguard
• Rail-height gas block accommodates flip-up sight
• Forward assist and dust cover included
• Includes BCG and charging handle

Order today!

Key Specifications