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Bushmaster AR-15 A3 Upper Receiver Assembly w/ Bolt Carrier Group - 5.56/.223 NATO 16" Barrel

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Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

Product Options


An excellent value for your next build, this complete upper includes the bolt carrier group. Just add it to any lower and you're ready to go!

This Bushmaster XM15 A3 upper comes fully assembled with charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly, and it will attach to any standard AR-15 lower receiver.

The 16" chrome lined barrel features a 1/9 twist for durability and accuracy. The barrel has a pinned front sight post with bayonet lug, a standard handguard, and a standard A2 flash hider. A rear sight is not included - just add a flip-up sight and/or optics and you're ready to go.


  • Receiver Type: Flat-Top with Picatinny Rail
  • Barrel Length: 16"
  • Barrel Contour: M4
  • Barrel Material: 4140 Chrome Moly Steel
  • Muzzle Thread Pattern: 1/2" -28
  • Chrome Lined: Yes
  • Barrel Finish: Parkerized
  • Twist Rate: 1 in 9"
  • Chamber: 5.56x45mm NATO
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Gas System Length: Carbine
  • Gas Block Diameter: 0.750"
  • Handguard: A2 Style
  • Sights: A2 Front
  • Bolt Carrier Type: Commercial

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