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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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90 Day No-Hassle Returns We Pay Return Shipping

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

If you need to request a return, contact us at support@at3tactical.com 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 support@at3tactical.com. We may direct you to pursue your warranty claim directly with the manufacturer.

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If you’re dissatisfied with your purchase, in any way, please contact us at support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

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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