CMMG Endeavor MK3 6.5 Creedmoor 20" Upper Receiver Group - Black

The CMMG Endeavor MK3 6.5 Creedmoor 20" upper receiver group is a complete long-range rifle upper built for shooters who want precision performance without unnecessary bulk. Built on the proven LR-308/DPMS Gen 1 High-Pattern platform, this 6.5 Creedmoor upper balances the reach and downrange punch you need for extended-range hunting or target work with a 20-inch barrel that keeps your overall rifle package manageable in the field or at the bench. CMMG ships this upper fully assembled with a bolt carrier group installed and a carefully selected suite of matched components—everything you need to get behind glass and start shooting.

The 6.5 Creedmoor chambering and 1:8 barrel twist are purpose-built for the heavy, high-BC projectiles that make this caliber a modern favorite for hunters tackling elk-sized game at distance and competitive shooters chasing small groups at 600 yards and beyond. The 416 stainless steel barrel features a heavy taper (HT) contour for stiffness and consistent accuracy; a ZEROED muzzle brake threads onto a standard 5/8x24 muzzle shoulder. Direct impingement operation keeps the upper lightweight and reliable, fed by a fixed rifle-length gas port and non-adjustable 0.750" gas block.

The billet 7075-T6 aluminum upper receiver and CMMG EML15 M-LOK handguard give you a solid mounting platform for your optics and accessories, while the included ZEROED ambi charging handle and polymer dust cover add real utility. Finished in tough Cerakote, the whole package tips the scale at just 6.1 lbs and measures 30.3" tip to tail—a genuine upper that plays well with most modern .308-pattern lowers.

Key Features

• Complete upper receiver group with bolt carrier group installed and tested
• 20-inch 416 stainless steel barrel with 1:8 twist for 6.5 Creedmoor ammunition
• LR-308/DPMS Gen 1 High-Pattern platform—proven design used by thousands of shooters
• Direct impingement operating system for reliability and low maintenance
• Billet 7075-T6 aluminum upper receiver for durability and precision
• CMMG EML15 M-LOK handguard for modern accessory mounting
• ZEROED ambi charging handle, polymer dust cover, and 6.5mm muzzle brake included
• Lightweight at 6.1 lbs—keeps your finished rifle nimble
• Cerakote finish stands up to field use and harsh conditions

Specifications

Frequently Asked Questions

What lower receiver is this upper compatible with?

The CMMG Endeavor MK3 upper is built on the LR-308/DPMS Gen 1 High-Pattern platform, so it is compatible with modern .308-pattern lowers that follow that design standard. Always verify your lower receiver's compatibility before assembly.

Is the bolt carrier group included and installed?

Yes. This is a complete upper receiver group that ships with the bolt carrier group already installed. You do not need to source a BCG separately—just mount it to a compatible lower and you're ready to configure.

What is included in the box?

The upper arrives fully assembled with a CMMG ZEROED ambi charging handle, ZEROED polymer dust cover, and ZEROED 6.5mm muzzle brake already attached. Everything needed to mount the upper onto a .308-pattern lower is included.

Is this upper suitable for long-range hunting?

Yes. The 6.5 Creedmoor chambering, 1:8 barrel twist, and 20-inch barrel are well-suited for long-range hunting applications where shooters want to use premium, high-BC projectiles. The direct impingement system and heavy-taper barrel contour support consistent, accurate fire at distance.