Faxon Firearms 5.56 M16 Bolt Carrier Group - Nitride Finish (FF556BCGCNITRIDE)

The Faxon Firearms 5.56 M16 Bolt Carrier Group in Nitride finish is a mil-spec internal component built for shooters and builders who demand reliability without compromise. Built from 9310 tool steel and heat-treated to military specifications, this BCG delivers the dependable function you need whether you're assembling a precision rifle, running a duty-grade build, or maintaining a battle rifle. The Nitride finish provides a durable, corrosion-resistant surface that stands up to hard use and is easy to maintain—no polishing, no fussing.

What makes the Faxon BCG worth choosing is the engineering underneath. The bolt features chamfering on the rear of the locking lugs to reduce wear and extend service life, and the carrier was shot-peened to specification for added strength. The group comes fully assembled with the firing pin spring, insert, and Crane O-ring already installed, so you can drop it straight into your upper receiver without hunting for parts or dealing with loose components. The M16 profile means it's compatible with full-auto lower receivers and features serrations that mate correctly with your upper's forward assist—true mil-spec compatibility, not a compromise.

Whether you're an experienced builder accustomed to swapping parts or someone building your first rifle, a quality BCG is the foundation of reliability. Faxon's attention to heat-treat, shot-peening, and finishing standards means this carrier will cycle reliably for tens of thousands of rounds. All-black appearance, mil-spec dimensions, magnetic particle inspection—this is the kind of boring, dependable part that lets you focus on what matters: shooting accurately.

Key Features

• 9310 tool steel construction, heat-treated and shot-peened to military specifications
• Chamfered rear locking lugs for reduced wear and extended service life
• Nitride finish for corrosion resistance and low maintenance
• Fully assembled with firing pin spring, insert, and Crane O-ring installed
• M16 profile compatible with full-auto lower receivers
• Serrated design compatible with standard upper receiver forward assist
• Magnetic particle inspected for quality assurance
• Designed for 5.56 NATO ammunition

Specifications

Frequently Asked Questions

Is this bolt carrier group compatible with my 5.56 rifle build?

Yes, the Faxon M16 BCG is designed for 5.56 NATO and features mil-spec dimensions that work with standard upper receivers. The M16 profile is compatible with both semi-auto and full-auto lower receivers, and the serrated design mates with your upper's forward assist.

What comes installed with the bolt carrier group?

The BCG arrives fully assembled with the firing pin spring, insert, and Crane O-ring already in place. You won't need to source or install these parts separately—just install the carrier into your upper.

Why does this BCG cost more than some alternatives?

The Faxon uses 9310 tool steel with proper heat-treat and shot-peening to mil-spec standards, plus chamfering on the locking lugs to reduce wear. The Nitride finish resists corrosion and requires less maintenance than bare steel. These are the kinds of details that add up to longer service life and more reliable cycling.

Will the Nitride finish scratch or wear off with normal use?

Nitride is a surface treatment that becomes part of the steel itself through salt-bath hardening, making it more durable than applied finishes. It will show normal wear marks from use, but won't flake or peel like some coatings.