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.

• 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. 
• 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