4 Best 6.5 Grendel BCG For AR15

Here are the 4 best 6.5 Grendel bolt carrier groups for AR15 builds. The 6.5 Grendel BCG itself is has the same functionality as a 5.56 BCG besides the bolt.

There are many options out there, and we have narrowed down to the ones that are most purchased to save you time.

Check out what we have here:

Aero Precision 6.5 Grendel BCG - Best Overall

Aero Precision 6mm ARC, 6.5 Grendel Bolt Carrier Group, AR15, Nitride Finish, Black, APRH100725C

Aero Precision makes great AR15 parts and accessories from top to bottom. Their new 6.5 Grendel BCG is machined from 8620 steel (MPI tested) with nitride finish for reduced bolt travel friction and increased service life.

It also features forward assist serrations for receivers with forward assist, and it also works with receivers without it.

Bolt Material - 158 tool steel

BCG Material - 8620 steel

Weight - 11.52 oz

Coating - Black Nitride

Bolt Type - M16 Full Auto (No full auto without full auto lower)

Pros

  • Affordable
  • Smooth surface
  • Great design
  • HPT and MPI tested
  • O-Ring

Cons

  • Not much

Also check out Aero Precision M4E1 complete upper with 6.5 Grendel BCG here

Faxon 6.5 BCG - Best For Recoil Reduction

Faxon Firearms Faxon 6.5 Grendel, Type II, M16, Nitrided, Bolt Carrier Group, FF65GBCGCNITRIDE

This is a Type II MPI tested and fully heat treated Mil-Spec bolt carrier group. It features 45 degree chamfered bolt lug to increase service life even for the highest pressure rounds.

The gas keys use Grade 8 fasteners and they are fully staked for long period of use.

Bolt Material - 9310 tool steel

BCG Material - 8620 steel

Weight - 12.5 oz

Coating - Salt Bath Nitrided

Bolt Type - M16 Full Auto (No full auto without full auto lower)

Pros

  • Affordable
  • Smooth surface
  • Great design
  • HPT and MPI tested
  • O-Ring

Cons

  • Slightly pricey
  • Heavier than others
JP Enterprises Complete bolt carrier group including JPBC-3 6.5 Grendel low mass polished carrier and JPEB-6.5, Silver JPBC-3SPA-6.5G

Bolt Material - 9310 tool steel

BCG Material - 8620 steel

Weight - 8.8 oz

Coating - Stainless Steel

Bolt Type - M16 Full Auto (No full auto without full auto lower)

Pros

  • Affordable
  • Smooth surface
  • Great design
  • HPT and MPI tested
  • O-Ring

Cons

  • Pricey

TRYBE Defense 6.5 BCG - Best For The Money

TRYBE Defense Milspec Complete 6.5 Grendel Bolt Carrier Group-Type 2 Bolt Face, Black Nitride, BCG65GREN-QPQ

Bolt Material - 158 tool steel

BCG Material - 8620 steel

Weight - 11.3 oz

Coating - Black Nitride

Bolt Type - M16 Full Auto (No full auto without full auto lower)

Pros

  • Great price point
  • Nothing fancy
  • HPT and MPI tested

Cons

  • Not much

FAQ

Differences Between 5.56 vs 6.5 BCG

The difference between 5.56 and 6.5 BCG is the bolt. The bolt carrier is the same.

Differences Between Type I and II Grendel Bolt

The biggest difference between Grendel Type I vs Type II is head spacing.

Type I is known as the 7.62X39 bolt - Bolt face is 0.125"

Type II is the original Grendel, now people just call it Grendel Type II - Bolt head spacing is 0.136"

Does A 6.5 Grendel BCG Fit Inside A Standard AR15 Upper Receiver?

Yes, 6.5 Grendel BCG fit inside any standard AR15 upper receiver.

Can You Use A 556 Lower For 6.5 Grendel?

Yes, a 5.56 lower receiver works with 6.5 grendel upper (Of course, while using a 6.5 Grendel BCG)

Is Bolt Carrier Group Different Than Bolt?

Bolt Carrier Group (BCG) contains the bolt. 

This is the bolt people talk about

ar15 bcg bolt head


This is the bolt carrier group that hold the bolt, firing pin, gas key and retainer pin

Ar15 bolt carrier group

When assembled, the BCG looks like this:

aero precision bcg nickel boron


Why 6.5 Grendel Cartidge?

Overall, 6.5 Grendel is a much more effective hunting round for the AR 15 platform. Some call it the "Fatter 5.56". Most 6.5 Grendel ammo range between 90 - 130 grain bullet weight, and it packs more ballistic energy.

Standard 55gr 5.56

  • Bullet Diameter:0.224"
  • Case Length: 1.76"
  • Rim Diamenter: 0.387"
  • Total Length: 2.25"
  • Max Pressure: 55K PSI
  • Max Range: Max effective about 450 yards
  • Max Energy: 1282 ft lb (Muzzle), 750 (200 yd), 290 (500 yd)

Standard 123 gr 6.5 Grendel

  • Bullet Diameter:0.264"
  • Case Length: 1.52"
  • Rim Diamenter: 0.441"
  • Total Length: 2.26"
  • Max Pressure: 52K PSI
  • Max Range: Max effective up to 800 yards
  • Max Energy: 1818 ft lb (Muzzle), 1376 (200 yd), 870 (500 yd)

Other than the dimensional differences, the 6.5 Grendel has the edge in terms of maintaining high kinetic energy at all ranges while the standard 5.56's ballistic trajectory can stay fairly flat (Lacks energy)

With all things considered, the 6.5 Grendel is more powerful and less than a standard 308 round.

The best part is that the overall AR15 platform doesn't change, only the barrel and BCG need to be changed while still using the same lower receiver.