Here are the 4 best 300 Blackout BCG for AR15 builds. The 300 BLK BCG is the same as a 5.56 BCG but just named differently. Essentially it's a 5.56 BCG.

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:

Best 300 Blackout Bolt Carrier Group Upgrades

Disclosure: All products have affiliate links for earning commission to support the website when you purchase

Palmetto State Armory BCG - Best Overall

psa bcg

Palmetto State Armory makes great AR15 parts. This is their newest 300 Blackout BCG deal with 10 Magpul magazines (Check your state law before ordering, purchase the bolt ONLY here)

The bolt 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 - 9310 tool steel

Coating - Black Nitride

Bolt Type - M16 Full Auto 

Pros

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

Cons

  • Not much

Toolcraft BCG

toolcraft bcg

This is a MPI tested nickel boron 300 Blackout carrier group that also works with 5.56. The gas key features Grade 8 hardened fasteners and it's staked for improved durability.

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

Bolt Material - 158 Steel Bolt (Shot peened bolt)

Coating - Nickel Boron

Bolt Type - M16 Full Auto

Pros

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

Cons

  • None

Aero Precision 300 BLK BCG - Lowest Weight

Aero Precision APRH100615 AR-15 Bolt Carrier Group 5.56mm 8620 Steel Black Nitri

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 300 AAC BCG - Best For The Money

TRYBE Defense Milspec Complete Bolt Carrier, Black Nitride, BCG-BN

All TRYBE defense AR15 bolts are machined from ultra durable 8620 steel up to mil-spec conditions to provide reliable use. Every bolt is HPT and MPI tested to work with 223, 5.56 or 300 Blackout AAC.

Bolt Material - 8620 steel

Coating - Black Nitride, Gold Titanium, Metallic Chrome, Nickel Boron

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 300 BLK BCG

They are the same. 

300 BLK and 5.56 has the same shell dimensions, but different caliber sizes.

Is Bolt Carrier Group Different Than Bolt?

Bolt Carrier Group (BCG) contains the bolt. 

This is the bolt people talk about