Aero Precision X15 Receiver Set – AR-15 Lower Receiver with Assembled Upper Receiver

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This item is regulated, therefore your entire order will be shipped to an FFL dealer of your choosing. After you place your order, we will contact you to finalize these details.

Orders will Ship within 1 Business Day
AT3™ AR-15 Bolt Carrier Group -  5.56 NATO/.300 Blackout - Black Nitride

AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Black Nitride


Aero AR-15 Lower and Upper Receiver Set

Aero Precision’s X-15 receiver set makes a solid foundation for your next AR-15 build. This matching set of lower and upper receiver includes all the great features of Aero’s Gen 2 lower, including a flared magazine well and upper tension screw. The assembled upper receiver features a pre-installed forward assist and dust cover, and has a matching finish with the lower.

With these two essential pieces, you can focus on the fun parts of building your rifle. Select your barrel, bolt carrier group, lower parts kit and trigger, and of course a buffer assembly and stock. Plus, this handguard mates beautifully with Aero Precision’s ATLAS R-One and S-One handguards. Whatever rifle you’re putting together, you can’t go wrong with this kit.

The Perfect Fit for Your Next Build

  • Upper Tension Screw – The lower receiver users to fine-tune the fit of the upper and lower receiver with a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with the included upper receiver.
  • Increased Magwell Flare – Allows for easier insertion of magazines and provides a sleeker look.
  • Matching Finish – Aero precision takes pride and care in matching the finish on this bundled receiver set – both upper and lower will look great together.


Note: Burnt Bronze and OD Green receiver sets also include a billet trigger guard.


  • Shipping to FFL Dealer Required: Yes
  • Platform: AR15
  • Material: Machined from 7075-T6 forged aluminum
  • Finish: Hardcoat Anodized Black, Magpul FDE Cerakote H-267, Magpul OD Green Cerakote H-232, Burnt Bronze Cerakote H-148
  • Markings: “Cal Multi”
  • Compatibility: Works with standard AR15 components and magazines
  • Weight: 8.35oz

NOTE: Rear takedown pin detent hole is threaded for a 4-40 set screw

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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.

Customer Reviews

Based on 1 review
Nathan Olsen

Great upper and lower!

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.