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.

This complete upper includes our popular ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real estate to accommodate any attachment needs the end user may have. Our proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

**** 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-T Complete Upper, Special Edition: Thunder Ranch, 16" 5.56 Mid, 15" M-LOK R-ONE w/ VG6 Delta - Anodized Black
Out Of Stock / Not Available For Back Orders 1 $594.00 $565.00
M4E1-T Complete Upper, Special Edition: Thunder Ranch, 16" 5.56 Mid, 15" M-LOK R-ONE w/ VG6 Delta - FDE Cerakote
Out Of Stock / Not Available For Back Orders 1 $619.99 $585.00


  • M4E1 Threaded Assembled Upper Receiver, Special Edition: Thunder Ranch
  • 15" ATLAS R-ONE Handguard of choice
  • 16" 5.56 Mid-Length CMV Barrel
  • Low Profile Gas Block and Mid Length Gas Tube
  • VG6 Precision Delta 556
  • Magpul MBUS Front/Rear Flip-Up Sights - Black
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab

M4E1 Thunder Ranch Threaded Upper Receiver Features:

  • Thunder Ranch Logo on tang
  • No Forward Assist
  • New enhanced forging that gives the upper receiver a "billet look"
  • New picatinny profile that blends seamlessly with our Enhanced Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door installed

ATLAS R-ONE Handguard Features:

  • Full top picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3" Inside diameter
  • 1.5" Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels
  • Learn More about our NEW ATLAS Handguards

16" 5.56 Mid-Length Barrel Features:

  • 5.56 NATO 16" Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested

Made In America?Yes
Caliber5.56 NATO
Barrel Length16"