Fail Zero Assembled Bolt Carrier Group Ar-15 5.56/.223/300 Blackout Black

The Fail Zero Assembled Bolt Carrier Group is a complete, ready-to-run BCG engineered for AR-15 platforms chambered in 5.56 NATO, .223 Remington, and 300 Blackout. It arrives fully assembled and drops into most mil-spec AR-15 upper receivers, eliminating the need for individual component sourcing or assembly. The entire carrier is finished in black and built to handle the demands of precision shooting, hunting, and tactical training without breaking stride.

What sets this BCG apart is its EXO Nickel Boron coating—a permanent surface treatment applied to critical parts that delivers dry lubricity without relying on oil or grease. That matters in the field: you get reliable operation in dusty hunting conditions, desert runs, or indoor range sessions where traditional lubricated carriers attract fouling and grit. The nickel boron finish also resists corrosion, keeping your bolt carrier group functional whether you're shooting in rain, snow, or across a dry climate.

This is the carrier for shooters who want a plug-and-play upgrade that reduces maintenance headaches. Whether you're building a new rifle, refreshing an older upper, or keeping a spare BCG on hand, the Fail Zero design prioritizes durability and minimal upkeep—so you spend more time shooting and less time cleaning.

Key Features

• Fully assembled and ready to install into mil-spec AR-15 uppers
• EXO Nickel Boron coating for permanent dry lubricity
• Reduced corrosion resistance and extended service life
• Compatible with 5.56 NATO, .223 Remington, and 300 Blackout
• Black finish
• Minimal maintenance design—operates effectively without traditional oil-based lubrication

Specifications

Frequently Asked Questions

Will this bolt carrier group fit my AR-15?

The Fail Zero BCG is designed for most mil-spec AR-15 upper receivers and is compatible with 5.56 NATO, .223 Remington, and 300 Blackout. Verify your upper is mil-spec before ordering to ensure proper fit.

Does the EXO Nickel Boron coating require lubrication?

The nickel boron coating provides permanent dry lubricity, meaning the bolt carrier group operates effectively without traditional oil-based lubrication. This reduces fouling and maintenance in harsh conditions.

What comes in the box?

You receive a fully assembled bolt carrier group ready to drop into your upper receiver—no additional components or assembly required.

Is this BCG suitable for 300 Blackout?

Yes. The Fail Zero Assembled Bolt Carrier Group is compatible with 300 Blackout along with 5.56 NATO and .223 Remington.