6.5 Creedmoor AR-10 Build

Best 6.5 Creedmoor Bolt Carrier Groups (BCG)

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Are you currently looking for the best 6.5 Creedmoor bolt carrier group for your AR-10? If so, this is the article for you. We’ll go over the best 6.5 Creedmoor bolt carrier groups available:

  • Brownells 308 AR Bolt Carrier Group: Best Value for Money
  • Aero Precision AR 308 Bolt Carrier Group: The Best Overall Pick
  • PSA Gen 2 Nitride 6.5 Creedmoor Bolt Carrier Group: Best Budget Option Bolt Carrier Group
  • Faxon .308/6.5 Creedmoor Bolt Carrier Group: Advanced Option Bolt Carrier Group

This article will also talk about why a 6.5 Creedmoor round is a good choice, as well as what makes a good bolt carrier group. We’ll also go through the most critical aspects to think about when choosing the best bolt carrier group for your AR-10. Without further ado, let’s get started.

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Why Go With A 6.5 Creedmoor AR-10?

Before we even begin our discussion of bolt carrier groups, it’s worth answering this question: why even go with the 6.5 Creedmoor round in the first place?

Best 6.5 Creedmoor Bolt Carrier Groups (BCG)
(Winchester 6.5 Creedmoor; Photo credit: RonSpomerOutdoors)

If you are not so keen on the background stuff, feel free to move on to the review section.

The 6.5 Creedmoor has become one of the most popular centerfire rifle rounds in the twelve years it has existed. It’s a type of 6mm round that first appeared in 2008.

.30 caliber rifles such as the .308 Winchester, .30-06 Springfield, and .300 Win Mag are popular with American shooters. It is because they were widely used in the military. In Europe, 6mm cartridges were more common. However, this caliber found its way over to the United States and has risen in popularity over the decades. In many ways, the 6.5 Creedmoor represents the pinnacle of the 6mm series of rounds in the United States. At least in terms of popularity.

The 6.5 Creedmoor developed out of the .260 Remington round. While this is an excellent round it’s too long for magazine-fed, semi-automatic rifles. The 6.5 Creedmoor is a shorter round and more reliable, just as the .308 Winchester was created to be a more reliable, shorter version of the .30-06 Springfield.

The 6.5 Creedmoor has superior terminal ballistics compared to the .308 over long ranges. Additionally, the 6.5 Creedmoor kicks slightly less than the .308 while hitting harder and flatter at longer distances.

An AR-10 chambered in the 6.5 Creedmoor round is a formidable weapon. It also fulfills many different roles and successfully executes these roles well. The 6.5 Creedmoor round can bring down any big game in North America, including deer and elk. The AR-10, combined with the long-range accuracy potentials of the round, makes it a superb choice for hunting.

Since the AR-10 is a semi-automatic and magazine-fed weapon, a 6.5 Creedmoor AR-10 would be a solid choice for a tactical firearm as well. You can use it for home defense, or as a general-purpose SHTF (S**** Hits The Fan) weapon, to hunting.

If you had to bug out into the woods during an SHTF situation, an AR-10 in a 6.5 Creedmoor would be an ideal firearm choice.

What Is a Bolt Carrier Group?

The bolt carrier group is the beating heart of your AR-10. Without the bolt carrier group or BCG, your AR-10 literally would not be capable of firing.

As you may already know, you can locate the bolt carrier group on the upper receive part of your AR-10. To use it, first, take your 6.5 CM upper receiver. Then slide the entire bolt carrier group through the rear of the receiver until it locks. Afterward, you can merge the upper and lower receiver together to create a complete rifle.

When you fire your AR-10, the gases created from the fired 6.5 Creedmoor round will be redirected back down through the gas tube to the bolt carrier. The gas then fills up the chamber in the bolt carrier group, forcing the carrier group back against the recoil spring of the rifle. Speaking of recoil, a great way to limit the felt recoil of your rifle is to install a 6.5 Creedmoor muzzle brake.

The more the bolt carrier travels backward, the more it twists until it unlocks from the chamber. The entire action of the rifle is then permitted to cycle back rearward until it ejects the spent shell out of the rifle. Then a new round is inserted into the chamber.

If the bolt carrier group did not exist on your AR-10, the firing pin could not strike the primer. Therefore, the rifle would not be able to fire in the first place.

The primary components of the BCG

Bolt Carrier

Some folks confuse the terms “bolt carrier” and “bolt carrier group,” thinking that both refer to the same thing. However, they do not. It’s because the bolt carrier is a part of the overall bolt carrier group or BCG. On the other hand, the bolt carrier contains the pieces necessary to allow the bolt carrier group to operate.

The bolt carrier works by contacting the spring and the buffer. Then it absorbs the force and gas from the fired round. The best bolt carriers are built out of 9310 steel, 8620 steel, or 158 steel for durability and longevity.

Carrier Key or Gas Key

On the other hand, the terms “carrier key” and “gas key” refer to the same thing. You can find the carrier key on the top of the bolt. In addition, it resembles little more than a small protrusion. Moreover, its primary purpose is to absorb the gas that travels down the gas tube of the AR after firing the rifle.

The carrier key permits the gas to travel through it and then into the rest of the carrier. Without the carrier key, the bolt and extractor would not be able to rotate.

Bolt Gas Rings

The bolt gas rings trap the gas of the spent round as the gas expands, allowing the bolt to work. Without the gas rings, the gas would disperse into the rest of the upper receiver, causing the weapon to malfunction.

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Bolt and Extractor

The bolt and extractor are the same unit but serve two different purposes. The bolt looks like a star on the front and allows the bolt carrier group to lock or unlock within the chamber. When it comes time to unlock the bolt carrier group, the bolt will rotate at fifteen degrees.

On the other hand, the extractor hooks onto the outer rim of each 6.5 Creedmoor round. It also holds the shells in place to load them into the chamber. Once the gun cycles, the ejector’s spring forces the casing to exit the receiver through the ejection port before cycling a new 6.5 Creedmoor round from the magazine to the weapon.

Firing Pin

The firing pin strikes the primer of the 6.5 Creedmoor round when you pull the trigger. Without the firing pin, the weapon would be incapable of firing. You can find the pin at the head of the bolt.

Cam Pin

Lastly, the camp pin stops the bolt from rotating too far once it unlocks. You can find the camp pin in the carrier through a hole located next to the bolt. Another hole in the middle of the pin permits the firing pin to slide through it, allowing contact with the round’s firing pin.

Buyer’s Guide For A 9mm Bolt Carrier Group

These are the most important factors to consider when looking for a new bolt carrier group for your 6.5 Creedmoor AR-10:

Magnetic Particle Inspected (MPI)

Always make sure that your bolt carrier group is magnetic particle inspected or marked as MPI. MPI means that the bolt carrier group has been placed into a magnetic field created by two electromagnetics. It uses a liquid solution of magnetic particles to cover the steel. This will identify any cracks or fissures in the steel. It also ensures that the bolt carrier group is safe to use over the long term.

You can guarantee that any bolt carrier group that is MPI-inspected will last for several rounds of sustained firing. Also, keep in mind that when you shoot your AR-10, the bolt carrier group is literally subjected to tens of thousands of pounds for each square inch.

High Pressure Testing (HPT)

In addition to MPI, your bolt carrier group should also come with HPT or high pressure testing. HPT means that the bolt carrier group can fire high-pressure cartridges, including rounds above SAAMI specifications. Additionally, getting a BCG that is capable of handling such ammunition is your choice. However, it’s always a good idea to get one to make your bolt carrier group last long.


It’s best to get a drop-in bolt carrier group to quicken the installation of your bolt carrier group in your AR-10. Getting one means easy installation of the BCG into your AR-10 without the aid of any extra tools or a gunsmith.


Last but not least, don’t neglect the price. The reason to get a bolt carrier group assembled rather than buying and putting the parts together on your own is to save money. With that in mind, bolt carrier groups still aren’t cheap. The best advice is to buy the highest quality bolt carrier group that you can afford.

Best 6.5 Creedmoor Bolt Carrier Groups

We covered why you need to upgrade your bolt carrier group for your AR-10. Now, let’s discuss the best 6.5 Creedmoor bolt carrier groups:

Brownells 308 AR Bolt Carrier Group

The Brownells 308 AR Bolt Carrier Group is made for the .308 Winchester and 7.62x51mm NATO cartridges. However, it will work for a 6.5 Creedmoor as well. In addition, Brownells 308 AR Bolt Carrier Group is one of the most affordable bolt carrier groups on the market. Yet, it doesn’t sacrifice its quality. The quality is exceptional. This bolt carrier group is made of hardened steel with a black nitride finish for rust and corrosion resistance.

Each element of this bolt carrier group has undergone magnetic particle inspection. MPI ensures that every square centimeter of the bolt carrier group is durable and safe. In addition, Brownells built the bolt of this carrier group with sturdier steel than the rest of its parts. They also designed it to last for tens of thousands of shots.

Overall, the Brownells 308 AR Bolt Carrier Group is an ideal option for its durability. It’s affordable, made of high-end steel, has a nitride finish for corrosion resistance, and is MPI-tested.

  • Heat treated for extra durability
  • Steel material is sturdy
  • Relatively affordable for a bolt carrier group
  • Comes with a nitride finish for rust and corrosion resistance
  • Pin is rather short in length

Aero Precision AR 308 Bolt Carrier Group

The Aero Precision AR 308 Bolt Carrier Group is another BCG made for the .308 Winchester round. Similar to Brownells, you can also use it for the 6.5 Creedmoor.

This BCG is a high-end bolt carrier group made of steel. In addition, this bolt carrier group comes with a hard chrome coating finish. It adds to its appeal and helps improve the longevity of the device as well. Furthermore, it has a black nitride finish for rust resistance and added durability.

This BCG is both HP and MPI-tested, ensuring safety. To summarize, the Aero Precision AR 308 BCG is one of the highest quality bolt carrier groups for a 6.5 Creedmoor in existence.

  • Coated components to ensure solid reliability and to reduce friction
  • Comes magnetic particles inspected
  • Has a hard chrome finish for extra durability
  • Black nitride finish over the chrome
  • Expensive

PSA Gen 2 Nitride 6.5 Creedmoor Bolt Carrier Group

The PSA Gen 2 Nitride 6.5 Creedmoor BCG is made of durable 8620 steel and has a black nitride finish. It’s heat-resistant and can easily handle sustained firing.

This bolt carrier group is distinct because it comes with double ejectors. In addition, this design enables a smooth and seamless ejection of spent shell casings. You can use this carrier group on fully automatic AR-10s if needed since the double ejectors can handle the rapid ejection of spent rounds.

Take note that the firing pin is a little bit small. It’s best to make sure that you properly size your AR-10 before installing it.

Overall, the PSA Gen 2 Nitride 6.5 Creedmoor Bolt Carrier Group is a durable BCG with unique double ejectors. It’s ideal for those who like firing fast rounds.

  • Made of durable materials
  • Has a steel bolt assembly
  • Comes with dual ejectors
  • Firing pin is small

Faxon 6.5 Creedmoor Bolt Carrier Group

The Faxon bolt carrier group has set the bar for quality and value. The next BCG on this list also works with both the.308 Winchester and 6.5 Creedmoor calibers. Moreover, this bolt carrier group is MIL-Spec and improved to be a long-lasting bolt carrier group.

Faxon enhanced this bolt by using 9310 high-quality steel. This material is substantially stronger than conventional bolt materials. Additionally, it is corrosion-resistant and MPI-tested. Furthermore, it features a chambered 45-degree bolt lug which enables a reliable action under extreme pressures.

In addition, Faxon added a nitride finish to its bolt carrier groups to reduce friction and improve function. Unfortunately, there is only one ejector on this unit. However, it still allows for full auto firing, which is an excellent choice for full-auto weapon users. Gas keys are completely anchored and feature grade 8 fasteners for long service life.

Unsatisfaction is not an option with this product because of its heat-treated, MPI-tested bolt and extractor. In terms of quality and reliability, the Faxon bolt carrier group is a good choice.

  • Full-auto rated and MPI-tested
  • Durable and reliable
  • Superfinished carrier body for reduced friction
  • Made of high-quality materials
  • Lacks dual ejector capability

The Final Word

The 6.5 Creedmoor is an excellent rifle round, thanks to its outstanding ballistics and trajectories at long ranges. An AR-10 chambered in 6.5 Creedmoor would be a superb rifle for big game hunting, tactical use, or as a general-purpose SHTF weapon.

Remember, a bolt carrier group is what enables your AR-10 to function in the first place. The bolt carrier group is perhaps a vital component to invest in, especially if you want to upgrade your existing AR-10 or build a new one from the ground up.

Any of the bolt carrier groups we discussed in this article can be a worthy option for your AR-10. Alternatively, remember the buyer’s guide that we have covered earlier as well. Likewise, always ensure that you find a high-quality bolt carrier that matches your preferences.

Interested in learning more about 6.5 Creedmoor? Take a look at the following articles:

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