Ar-15 5.56Mm Full Auto Bolt Carrier Group Black

The LMT Defense AR-15 5.56mm full auto bolt carrier group is a mil-spec BCG built to the standard that has equipped U.S. military and professional shooters for years. This is the real deal—a full-auto rated carrier and bolt assembly designed for durability and reliability in both suppressed and unsuppressed AR platforms. Whether you're building a rifle from the ground up or upgrading from budget-bin parts, this BCG delivers the kind of performance you expect from a manufacturer with a proven track record supplying complete weapons systems to those who depend on their gear.

LMT Defense has manufactured AR-15 full-auto BCGs and replacement components for military and professional use, and this group reflects that heritage. It's the same basic design found in standard M16/M4 platforms, meaning parts commonality and support are straightforward. If your build calls for mil-spec reliability without compromise, this carrier group is a solid foundation.

The full-auto rating means this BCG handles the demands of selective-fire operation, but it works equally well in semi-auto rifles. Suppressors, standard barrels, various gas systems—this group cycles reliably across the spectrum. Black finish completes the package with a professional look and corrosion resistance.

Key Features

• Full-auto rated bolt carrier group for AR-15 platform
• Compatible with both suppressed and unsuppressed configurations
• Mil-spec design and manufacturing standards
• Professional-grade reliability backed by military service history
• Black finish

Specifications

Frequently Asked Questions

Will this BCG work in a semi-auto only AR-15?

Yes. The full-auto rating means it exceeds mil-spec requirements; it functions reliably in any standard AR-15 platform, semi-auto or full-auto.

Can I use this with a suppressed rifle?

Yes. LMT Defense designed this group to work reliably in both suppressed and unsuppressed configurations.

What makes this different from other AR-15 bolt carrier groups?

LMT Defense manufactures this BCG to the same standards used in complete military weapons systems. The full-auto rating and professional manufacturing history distinguish it from consumer-grade alternatives.

What's included?

You receive the complete bolt carrier group assembly. Check your rifle's manual or consult our team if you need guidance on installation or compatibility with your specific build.