Aero Precision M4E1 Base Builders Set w/ 15″ Atlas-R One M-Lok in Anodized Black

Original price was: $510.00.Current price is: $470.00.

In stock


Sometimes finding what you need for your AR build can be challenging, Western Mountain Sports set out to make it easier.  We’ve picked through our inventory and bundled items into Build Sets, putting components for your build all in one place and one order. Saving you the time and frustration of searching for parts.  Plus you get it all at our great low price.

Each build kit starts off with Aero Precision Lower and Uppers, and is then paired with compatible components from top well known and reliable brands you can trust.

The M4E1 Base Kit in FDE includes:

  • Aero Precision M4E1 Stripped Lower Receiver (FDE Cerakote)
  • Aero Precision M4E1 Assembled Upper Receiver (FDE Cerakote)
  • Atlas R-One 12” Handguard (FDE Cerakote)
  • AR15 Lower Parts Kit (minus fire control group and grip)


These core components are guaranteed to work with all standard AR15 parts.

For more information on each individual item listed in this kit, please visit the following product pages.

M4E1 Stripped Lower (FDE)
M4E1 Assembled Upper (FDE)
Atlas R-One 12” Handguard (FDE)


Local Pickup: Customers that order FFL Items (firearms or other serialized items) and select “Local Pickup” as their delivery method will be required to complete a Form 4473 and background check prior to taking possession of their order.  All firearms or FFL Items that are purchased from Western Mountain Sports have Form 4473 and NICS checks included, there is no additional fee to complete this process. 

Shipping: Federal law requires this product to be transferred through a licensed FFL dealer. Western Mountain Sports requires a copy of the dealer’s FFL for verification and shipping. It’s the customer’s responsibility to notify the dealer of the order and to ensure their chosen FFL will accept the transfer. For more information, please see our Shipping & Local Pickup policy.


Additional information

Shipping to FFL Dealer Required



FDE Cerakote


Atlas R-One 12"

Receiver Material

7075-T6 forged aluminum


5.56 NATO / .223


Multi Cal