The 6.5 Creedmoor was created to provide a more powerful, more accurate, and more efficient cartridge for long-range shooting – making it a top contender for serious competition. But your round is only as good as what you are shooting it through, which is why building your own rifle is a great way to ensure a truly customizable firearm for your specific needs.
Our best 6.5 Creedmoor upper receiver contenders are a great place to start when considering your parts options. We’ve listed some of our favorites below to help you narrow down your options.
Comparison Table of The 5 Best 6.5 Creedmoor Uppers
BRAND
Aero PrecisionM5E1 Assembled Upper Receiver 6.5 Creedmoor
DETAILS
- 18”, 20”, 22” barrel option
- 1:8 Twist
- DPMS compatible
- M-LOK handguard
Primary Weapons – AR 308 MK2 MOD 1-M Upper Receiver 6.5 Creedmoor M-LOK
- 18” barrel
- 1:8 Twist
- DPMS compatible
- M-LOK handguard
Stag Arms – Stag 10 6.5 Creedmoor Upper Receivers
- 22” barrel
- 1:8 Twist
- Mostly DPMS compatible
- M-LOK handguard
Knights ArmamentSR-25 Precision Rifle Complete Upper Receiver 6.5 Creedmoor M-LOK
- 22” barrel
- 1:8 Twist
- SR25 compatible
- M-LOK handguard
PA-65 20″ 6.5 Creedmoor 1:8 Stainless Steel 15″ M-LOK Upper With Adjustable Gas Block, BCG, and CH
- 20” barrel
- 1:8 Twist
- PSA compatible, AR-10 parts
- M-LOK handguard
6.5 CM Upper Receivers: DPMS vs ARMALITE
The 6.5 Creedmoor is a modified .30 caliber round with incredible energy potential for long-range accuracy. Built as a competition round, it also is a popular choice for long hunting shots as it offers more energy than a .308 Win and outperforms a .30-06.
Most people assume when they are shooting from a 6.5 Creedmoor platform, they are using an AR-10 rifle, but that isn’t always true – and unless you’ve been taught the difference between the AR 10 and LR 308 pattern, you most likely wouldn’t even know which was which. However, when shopping for a 6.5 CM build, mistaking one for the other could result in the inability to match your upper with your lower receiver.
DPMS LR308
The LR308 is about 99% of what you see in the firearm industry for sale. This offers a universal Mil-Spec design that provides interchangeable parts, providing you the ability to swap out various brands and styles. It also provides high quality, but more affordable option than a true AR-10 upper receiver, and lets you complete and customize your build much more easily.
Armalite AR-10
Although the AR-10 is the OG of .30 caliber tactical rifle platforms, once its original design patent expired, the door was open to other firearm manufacturers to take advantage of the Mil-Spec design. This resulted in the creation of a competitive design benefit to the platform. Although the AR-10 is still a dependable, modern designed rifle – it doesn’t offer the advantages and options of the LR308, and you will be much more limited in your options when building or modifying.
Knowing the Difference between the AR10 and LR308
The difference between the two is simple, and can be seen in the angular cut in the upper, lower right before the buffer tube housing seen on the AR10. The LR308 has it rounded instead. This makes them functionally different and keeps certain parts from being interchangeable. If you are looking for an AR-10 6.5 Creedmoor upper receiver, keep in mind what may not be compatible. These include:
- Upper and Lower Receiver
- Buffer Assembly
- Gas tube
- BCG
- Handguard
- Barrel nut
- Magazine catch
Lesser important parts can be swapped out if needed. These include:
- Dust Cover
- Charging Handle
- Gas Block
- Trigger Assembly
- Takedown springs and detents
- Pistol Grip
- Trigger Guard
- Castle Nut
- Safety Selector Lever
Upper Receiver Group Parts
Even though the upper receiver is not considered the ‘functional’ part of the firearm, it consists of the barrel, handguard, gas block and tube, bolt carrier group, and charging handle – and your firearm will not fire without it.
Gas Block System
The gas pressure system is what controls the proper firing, ejection, and chambering of a new round. The four gas system lengths designate the size and energy each expands and is related to the barrel length and cartridge size needed to take full advantage of what you have chambered. The 6.5 CM generally requires a rifle length system, but most uppers offer an adjustable gas block to prove you control over the cycling and timing.
Bolt Carrier Group
Included in the bolt carrier group is the firing pin, bolt, cam pin, and gas key that works to load, fire, and eject your cartridge. These come both pre-assembled or can be pieced together for a custom fit.
Charging Handle
A charging handle pulls the bolt carrier group back to allow the chambering of a round. It also allows you to eject faulty shells to reload to avoid jamming issues. Plus, it loads the first round of a new magazine if the bolt is closed.
Forward Assist
The forward assist isn’t a necessity, but it does ensure the bolt goes all the way back to the battery to provide dependability and a sense of enhanced reliability.
Barrel
Without a barrel, you won’t be shooting much at all and so you want to choose your barrel to the specifics of the type of shooting you plan on doing. The 6.5 CM shoots best with a 24 to 26-inch barrel and gets its best velocities. Shorter barrels will provide more maneuverability, or are desired for use with a suppressor.
Ejection Port Cover
Although not necessary, the ejection port cover is a desirable part of the upper and you would be hard-pressed to find a rifle that doesn’t have one. This helps keep dirt and debris from getting inside your firearm and opens easily to eject your rounds.
Rail System and Handguard
Along with the barrel, you need to consider the handguard and rail system you want. These come in various lengths and offer design styles to help with easy accessory addition and modification.
A Quick 6.5 CM Buyer’s Guide
When choosing your upper, it is best to consider a few good points about the material and overall design. These small details can mean the difference in your personal control and use of the finished product, as well as compatibility with other opponents of the complete build.
Materials
Receivers are usually made from 6061-T6 aluminum or 7075-T6 aluminum and are designed to handle the pressure of firing your rifle through one of three different processes: cast, billet, forged. Most are coated for corrosion resistance as well.
Cast
Cast uppers are made via die-casting with molten aluminum and carefully crafted molds. This is the most affordable option for civilian-approved rifles.
Billet
A billet receiver is CNC-milled from a solid piece of aluminum and is more expensive than the casing, but still offers affordability.
Forged
This is a more expensive option created by hammering a single piece of aluminum into shape. These are high quality in both strength and density.
Twist Rate
The 6.5 Creedmoor was created with a 140 – 143 weight bullet in mind, and the 1:7 or 1:8 is ideal to stabilize the heavier ammo and ensure you get the most out of it.
Thread Pitch
You’ll almost always find your barrel to have a ⅝-24 thread pitch to accommodate a wide variety of muzzle devices.
Rail Systems
A 6.5 CM barrel will almost exclusively have an M-LOK compatible handguard and Picatinny rail or Weaver rail system to easily modify and add accessories for personalization.
Compatibility
Most important is your upper compatibility with your chosen lower. Always check for the ability to match the upper with the lower without issue.
300 Blackout Lower Receivers Worth Taking a Closer Look At
1. Aero PrecisionM5E1 Assembled Upper Receiver 6.5 Creedmoor
- 18”, 20”, 22” barrel option
- 1:8 Twist
- DPMS compatible
- M-LOK handguard
The Aero Precision “boringly accurate” M5E1 6.5 CM upper is a forged 7075 T6 aluminum receiver, hard coat anodized matte black option that was created to be the foundation for lightweight, tack-driving use. The M5E1 is designed to fit a DPMS Gen 1 LR-308 lower and clones and accepts any DPMS compatible bolt carrier group and charging handle you desire. Choose from an 18 inch, 20 inches, or 22 inches 416R stainless steel target barrel with a 1:8 inch twist rate.
The 18 inch comes with a mid-length gas system, but the rifle-length gas system for anything longer. It is fitted with the manufacturer’s Gen 2 M-LOK handguard with an uninterrupted gap-free, full-length Picatinny top rail, and QD sling swivel sockets at 3/6/9 o’clock positions.
Pros
- Choice of barrel length options
- Lightweight and well balanced
- Handguard offers ample rail space and tons of options for customization
Cons
- Choose your own BCG and charging handle (which can be a plus for many)
2. Primary Weapons – AR 308 MK2 MOD 1-M Upper Receiver 6.5 Creedmoor M-LOK
- 18” barrel
- 1:8 Twist
- DPMS compatible
- M-LOK handguard
Primary Weapon Systems are known for their innovative designs, providing the MK2 MOD 1-M 6.5 Creedmoor upper with a PWS long-stroke piston system originally designed for their AR-15 platform to offer one of the most reliable and accurate shooting scenarios in its category. The 18-inch barrel provides long-range shooting abilities in a lightweight, solid option complete with a free-float M-LOK handguard. Lighting cuts and the elimination of the forward assist make this one of the lightest available.
Complete with a PRC 30 compensator for recoil control and reduction, it also includes a Radian Raptor Charging Handle and a fully adjustable, 3-setting gas system. This allows you control and accuracy for smooth operation and reliability.
Pros
- Long-stroke piston system is powerful and dependable
- The shorter barrel provides compact and lightweight use
- Solid design with excellent balance
Cons
- Shorter barrel doesn’t stand up to serious long-range shooting needs
3. Stag Arms – Stag 10 6.5 Creedmoor Upper Receivers
- 22” barrel
- 1:8 Twist
- Mostly DPMS compatible
- M-LOK handguard
Available in your choice of left or right-hand options, the Stag Arms Stag 10 6.5 is designed for optimal long-range performance when chambered with the 6.5 Creedmoor. Outfitted with a 22-inch barrel with a 1:8-inch twist rate, it is topped with a VG6 Gamma muzzle brake to reduce the mild recoil even further for a truly enjoyable shooting experience. The M-LOK handguard gives you plenty of space to modify your rifle to your own needs as well.
All that is needed to complete the build is a compatible Stag .308 lower, your choice of bolt carrier group and charging handle and you are ready to go. Keep in mind that according to the manufacturer, the Stag .308 line features a Stag Slant Cut design, and includes uniquely designed parts for the lower to guarantee the best fit between the upper and lower. The remainder of the rifle utilizes the DPMS .308 platform for parts compatibility.
Pros
- Powerful and designed with a dependable barrel and twist
- Included muzzle brake is effective
- Sleek, clean look
Cons
- Compatibility for fit is specific to the brand
4. Knights ArmamentSR-25 Precision Rifle Complete Upper Receiver 6.5 Creedmoor M-LOK
- 22” barrel
- 1:8 Twist
- SR25 compatible
- M-LOK handguard
Knights Armament offers an SR25 platform for their 6.5 Creedmoor with cutting-edge, long-range performance. The ballistic coefficient and muzzle velocity measures as one of the best in the industry. The 22-inch barrel offers a dimpled precision profile with a 1:8 twist rate for serious control and durability. The long 18-inch URX6 handguard provides plenty of space for in-line optic choices as well.
Because the company provides proprietary compatibility, you do have to watch closely for interchangeability with all parts. This is an excellent, truly top-quality choice worth considering even if you are limited in your options.
Pros
- One of the best quality choices you can buy
- Incredibly accurate and on target
- Tons of room for rail customization
Cons
- Very limited in compatibility
5. PA-65 20″ 6.5 Creedmoor 1:8 Stainless Steel 15″ M-LOK Upper With Adjustable Gas Block, BCG, and CH
- 20” barrel
- 1:8 Twist
- PSA compatible, AR-10 parts
- M-LOK handguard
Palmetto State Armory is well known for their firearm parts, and provides exceptionally affordable products without sacrificing quality for anyone looking to build their own rifle. The PA-65 offers precision-machined forged 7075-T6 aluminum and black anodized hard coated finish to MIL-8625 type 3 class 2 upper. The 20-inch barrel is made from a heavy 416R stainless steel, has a 1:8 inch twist rate, and fires from a rifle-length gas system for dependable velocity and superior accuracy.
It comes complete with a charging handle, and a 9310 steel bolt assembly, and 8620 carrier – both nitride treated. The low-profile gas block is dependable and helps provide lightweight balance. A 15-inch free-float M-LOK rail contains plenty of space for your accessory as well. Uppers are proprietary to PSA and fit PSA lowers. Many other AR-10 parts may be interchangeable.
Pros
- Incredible durable and lightweight
- Comes complete with BCG and Charging Handle
- Well made and nice to look at
Cons
- Uppers are proprietary
Conclusion
The 6.5 Creedmoor is the baddie of long-range shooting, and these are all great, high-quality uppers worth considering if you are looking to either start or complete a current build. Reliable uppers aren’t too difficult to find since gun manufacturers take great pride in their products, but it can be hard to narrow down your choices – which is why we are presenting the top picks we are. All offer reliable performance and are an excellent choice to consider.
We’d love the chance to answer any questions you may have, or help points you in the right direction. Let us know below! And, as always, please share!