Aero Precision Stripped M4E1 Slick Side AR-15 Upper Receiver

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AT3™ AR15 Ejection Port / Dust Cover Assembly


Stripped M4E1 Slick Side Upper for Lightweight AR-15

This stripped upper from Aero Precision uses all forged 7075-T6 construction, and drops the forward assist for a slicker, lighter weight upper that’s ideal for ambidextrous charging handles. This upper matches any other traditionally forged upper, with the added bonus of offering customization with any dust cover you want to add on.

All the essential dimensions on this upper are the same as on a traditional forged receiver.  Most handguards with anti-rotation features fit above the barrel extension with no modification.

This receiver is also a perfect match for the ATLAS R-One handguard, and the M4E1 stripped lower receiver.  Check it out if you’re doing a new upper build!


  • Billet looks and forged construction
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes ejection port cover and brass deflector


  • MATERIAL: Machined from 7075-T6 forged aluminum
  • FINISH: Anodized Black or Magpul FDE Cerakote
  • COMPATIBILITY: Works with all Mil-spec AR15/M16 components
  • WEIGHT: 6.5 oz

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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.