Aero Precision Assembled Slick Side AR 15 M4E1 Upper Receiver – No Forward Assist

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15 inch Black

Aero Precision ATLAS R-ONE M-LOK Handguard for AR-15 – 15" Black


Radian Raptor-LT Ambidextrous Charging Handle


Billet-Like Slick Side Upper for Lightweight AR-15

Aero Precision now offers the M4E1 version of their assembled slick side upper.  You get the sharp angles and sleek facets typical of billet receivers, with the light weight and durability of forged aluminum.  You also save weight, with lightening cuts on the top rail, and a lack of forward assist.

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.  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.