MPN: APAR700305M50 / APAR700705M50


  • Caliber: .223 Rem / 5.56 NATO
  • Chamber: .223 Wylde
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: 15-Inch ATLAS S-ONE or R-ONE M-LOK Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 16" 1:8 Twist 416R Stainless Steel Fluted Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Mid-Length Gas tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • HP and MPI Tested

*This upper assembly does not come with Bolt Carrier Group and Charging Handle

*ATLAS S-ONE Handguard: Front and rear Picatinny rail section. Eliminated center of top rail for weight reduction.

*ATLAS R-ONE Handguard: Full top Picatinny rail


  • Weight:
    • M4E1 Upper with 15" Atlas S-ONE Handguard: ~3.29 lbs.
    • M4E1 Upper with 15" Atlas R-ONE Handguard: 3~.37 lb.
  • Overall Length: ~24.4"


  • AR-15 lower receivers


  • 1x Aero Precision 16" Fluted .223 Wylde M4E1 Complete Upper Assembly


Have you ever wanted to put together your own AR-15 but are a bit leery of making just the right choices? I know, it can be a daunting task with the variety of parts out there. Piecing together parts is one thing, however, choosing components that work the way you expect them to is another thing altogether. Well, now you can put that project on the fast-track with an Aero Precision AR-15 upper with fluted barrel.

Custom Build AR-15 Fluted Barrel Upper in A Box

If you're a fan of versatility then an AR-15 fluted barrel upper chambered for .223 Wylde is just the ticket for you. This barrel can safely chamber the .223 as well as the 5.56 NATO round. Consequently, you benefit in the way of accuracy, price, and performance to fit your shooting needs. Aero Precision opts for high-quality 416R stainless steel from which to machine your new barrel which is fluted for additional strength. Their rugged upper gives you the benefit of forged aluminum strength and price but with the cool billet aluminum appearance. These are exactly the components you would pick to put together for yourself.

Gaining The Upper Hand

Of course, the Aero Precision AR-15 upper with fluted barrel comes with M-4 feed ramps for reliability, they know you wouldn't want anything less. Then there's the free-floating rail system. This must have perk gives your AR-15 fluted barrel upper a lean, mean, sleek look and feel. It's light, strong, improves accuracy, and gives you plenty of real estate for your grip preference and accessories. There's no need to mess around installing everything piecemeal and risk a mistake. Just grab an Aero Precision AR-15 upper with fluted barrel and your build is on the right track.

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Reviews (2)

  • Arrow precision 16 inch stainless steel fluted upper assembly

    Posted by Alphonso Estrada on 28th Dec 2021

    This arrow upper is very well-made the flooding is spectacular and the barrel I recently purchased a 20 inch fluted stainless steel barrel and in my own belt still very light at 20 inches but if you want something shorter with a 16 inch build I will highly recommend this upper especially now that I’ve already bought one for me and I’m not worried about you buying them all they are very accurate right out of the box I highly recommend taking a good look at this one for your next Build these are very nice quality uppers for the money you cannot beat it try it out

  • Gavin Kline

    Posted by Gavin Kline on 22nd Jan 2019

    Gavin Kline it’s was good

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