M4E1 Urban Laramie ATLAS S-ONE M-LOK Builders Set

M4E1 Urban Laramie ATLAS S-ONE M-LOK Builders Set


FFL ITEM – Must be shipped to FFL Dealer!
M4E1 Threaded Receiver Set, ATLAS S-ONE M-LOK Handguard, Weapon Works Cerakoted Urban Laramie


M4E1 Urban Laramie ATLAS S-ONE M-LOK Builders Set

Urban Laramie Cerakote by Weapon Works

The Aero Precision M4E1 Urban Laramie ATLAS S-ONE M-LOK Builders Set features a M4E1 stripped lower receiver, M4E1 Threaded Assembled Upper Receiver, and an ATLAS S-ONE M-LOK handguard in your choice of either 9″ or 15″.  In addition, we have made available a very limited quantity of Urban Laramie cerakoted Magpul furniture; all custom cerakoted by Weapon Works.   The M4E1 Urban Laramie ATLAS S-ONE M-LOK Builders set includes everything you need to begin the assembly of your own unique M4E1 firearm sure to impress your friends.

Check out all of our custom cerakoted builders sets here, or the M4E1 Urban Laramie Enhanced M-LOK Builders Set.

M4E1 Lower Receiver Features
  • Threaded Bolt Catch Roll Pin – Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included). 1/16″ Hex Key required for assembly.
  • Integrated Trigger Guard – Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower, creating a stronger more rigid platform to build upon.
  • Upper Tension Screw – Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver.
  • Threaded Takedown Pin Detent Recess – Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room).
  • Increased Magwell Flare – Increased the flare of the magwell to aid in quick and efficient magazine changes.
  • Marked and milled to accept short-throw safety selectors, but will work with standard selectors as well.

Click to see the Magpul Urban Laramie Furniture Options

Save up to $20 on Toolcraft Bolt Carrier Groups and Charging Handles when purchased together.
M4E1 Threaded Assembled Upper Receiver Features
  •  Enhanced forging to give a “billet look”
  •  M4 Feedramps
  •  .250 takedowns
  •  Includes installed dust cover and forward assist.
  • Front and rear picatinny rail
  • Eliminated center top of rail for weight reduction
  • Indexing grooves in 12:00 position for positive grip control
  • 1.3″ inside diameter | 1.5″ outside diameter
  • Compatible with low profile gas block
Each Builders Set Includes
  •  Urban Laramie Cerakoted M4E1 Stripped Lower Receiver
  •  Cerakoted Urban Laramie M4E1 Threaded Assembled Upper Receiver
  •  Cerakoted Urban Laramie ATLAS S-ONE M-LOK Handguard (9″ or 15″)
  •  ATLAS S-ONE barrel nut and mounting hardware.
Optional Add-Ons
  • Toolcraft Bolt Carrier Groups
  • Charging Handles

Product Information

Manufacturer:  Aero Precision | Weapon Works
Platform:  AR15 – Multi Caliber
Material:  7075-T6 Aluminum (Receivers), 6061-T6 (Handguard)
Finish:  Cerakote | Urban Laramie
Handguard Type:  ATLAS S-ONE M-LOK
Handguard Length:  9″ | 15″
Screw Torque:  25in-lbs

Additional information

Weight 1 oz
Dimensions N/A

Aero Precision, Weapon Works

Part Type

Handguard, Lower Receiver, Upper Receiver



Handguard Length

9", 15"

Coating Type



Urban Laramie

FFL Terms and Conditions

– Any items placed on the same order as a controlled item will also be shipped to the FFL. If you would like additional items shipped to you directly, please place them on a separate order.

– Please enter your information or the receiving party’s (the person that will be picking it up) information in “Order Notes” at check out.

– Prices do not include your dealer’s transfer fees.

– To expedite your order, please either you, or your dealer email their FFL to us. Your order will not be processed, until received, and validated.

Email: ffl@armorally.com or submit your FFL Here

There will be a 30% restocking fee on all controlled items returned because of failed background checks.

Federal law requires that you be 21 years or age or older to purchase a stripped receiver or frame. If a frame or receiver can only be made into a long gun (rifle or shotgun), it is still a frame or receiver not a handgun or long gun. However, they still are “firearms” by definition, and subject to the same GCA limitations as any other firearms. See Section 921(a)(3)(b). 18 U.S.C. Section 922(b)(1) makes it unlawful for a licensee to sell any firearm other than a shotgun or rifle to any person under the age of 21.