This Bolt Carrier Group from TacFire is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend cartridges, machined from 9130/8620 steel and finished in nitride for improved heat and corrosion resistance.

Key Specifications

• Compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend cartridges.
• Bolt machined from 9130 steel; carrier machined from 8620 steel.
• Finished in nitride for improved heat and corrosion resistance.
• Cut for full-auto compatibility with forward assist notches.
• MPI tested (magnetic particle inspection) to check for structural flaws.
• Shot peened for added durability.
• Made in the USA.

Frequently Asked Questions

Will this work in a semi-auto-only AR-15? Yes, a full-auto-cut carrier is also compatible with semi-automatic AR-15 lowers; the cut simply doesn’t add any function on a semi-auto-only lower.

What does MPI testing check for? Magnetic particle inspection checks the bolt for hairline cracks or structural flaws that could lead to failure under firing stress.

Buy the TacFire AR-15 5.56 NATO Bolt Carrier Group, Nitride

Add a nitride-finished, MPI-tested BCG to your AR-15 with this TacFire unit. It ships fast from our Lubbock, Texas gun shop, and our AR-15 bolt carrier groups selection has more AR-15 bolt carrier groups.