The Thunder Ranch product line is a joint venture between Aero Precision and Thunder Ranch. Aimed to achieve Clint Smith's ideal purpose built "Ultimate Carbine", these products include key features requested from Clint Smith himself but with an Aero Precision flare. Like everything surrounding the Thunder Ranch name, you get exactly what you need - nothing more and nothing less.

The M4E1 Complete Lower Receiver is the perfect base for your custom AR15 build. This complete lower features our Thunder Ranch Special Edition M4E1 Lower Receiver and is upgraded to include a MOE® Grip and MOE SL® Stock. Save when you buy it complete and let our specialists do the installation for you!

**** PLEASE NOTE*** Limit 1 Per Person. Any additional orders for customers will be cancelled without notice.

Item# Description Availability Qty
MSRP Price Choose Qty
M4E1 Carbine Complete Lower, Special Edition: Thunder Ranch, w/ALG Defense Trigger, MOE Grip & SL Stock - Anodized Black
Out Of Stock / Not Available For Back Orders 1 $319.99 $299.99
M4E1 Carbine Complete Lower, Special Edition: Thunder Ranch, w/ALG Defense Trigger, MOE Grip & SL Stock - FDE Cerakote
Out Of Stock / Not Available For Back Orders 1 $339.99 $320.00

 M4E1 Thunder Ranch Special Edition Lower Receiver Improvements:

  • Skeletonized Magwell - Cuts weight and provides a unique look for our M4E1 Lower Receivers.
  • 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.


  • M4E1 Stripped Lower Receiver, Special Edition: Thunder Ranch
  • MOE® GripMOE SL® Stock
  • Lower Parts Kit
  • ALG Defense Quality Mil-Spec Trigger (QMS)
  • AR15 Carbine Buffer, Tube and Spring
  • These parts are installed

Order Details

  • Not available where prohibited by law
  • Offer not available in all states
  • All web sales must go through a Federal Firearms Licensee
  • Your order confirmation will contain information on how to submit your qualification credentials and FFL's information
  • Coupon codes/Discount codes not applicable
  • Please check out the Individual Firearms Sales page for more details on the ordering process.
Made In America?Yes
Receiver ExtensionCarbine
CompatibilityWorks with standard AR15 components and magazines