Angstadt Arms AR-15 Bolt Carrier Group 5.56 NATO Black

Angstadt Arms AR-15 Bolt Carrier Group 5.56 NATO Black

Angstadt Arms
UPC:
853427007776
$128.69
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Description

The Angstadt Arms AR-15 Bolt Carrier Group in 5.56 NATO is a mil-spec precision component trusted by law enforcement and military professionals worldwide, delivering the reliability and durability your build demands.

  • Carrier machined from 8620 alloy steel for superior strength and longevity
  • 5.56 bolt precision-machined from Carpenter 158 tool steel, the mil-spec standard
  • Black nitride finish provides exceptional corrosion and wear resistance
  • High pressure tested (HPT) and magnetic particle inspected (MPI) for quality assurance
  • Manufactured to mil-spec dimensions for drop-in compatibility with standard AR-15 lowers
  • Same BCG Angstadt supplies to law enforcement and military customers globally

Who This Is For

This BCG is ideal for AR-15 builders, competitive shooters, and serious enthusiasts who refuse to compromise on reliability. Whether you're assembling a duty rifle, a precision range build, or upgrading a factory BCG that's let you down, the Angstadt Arms 5.56 BCG delivers the consistency and fit you need to run confidently in any conditions.

Angstadt Arms AR-15 5.56 NATO Bolt Carrier Group Black Nitride finish

Specifications

Brand Angstadt Arms
Caliber 5.56 NATO / .223 Remington
Carrier Material 8620 Alloy Steel
Bolt Material Carpenter 158 Tool Steel
Finish Black Nitride
Profile Full Auto / Mil-Spec
Testing High Pressure Tested (HPT)
Compatibility AR-15 / M16 Pattern Rifles
Country of Origin United States

Frequently Asked Questions

Is this BCG compatible with my standard AR-15 lower and upper receiver?

Yes. The Angstadt Arms 5.56 BCG is machined to mil-spec dimensions, making it a drop-in fit for any standard AR-15 or M16-pattern upper receiver. It is compatible with direct impingement 5.56 NATO and .223 Remington chambered rifles from virtually all major manufacturers.

What makes Carpenter 158 steel the preferred choice for AR-15 bolts?

Carpenter 158 is a high-strength tool steel alloy specified by the U.S. military for M16 and M4 bolts because of its exceptional toughness and fatigue resistance under high-pressure firing conditions. Bolts made from Carpenter 158 are better equipped to handle the stress of repeated firing cycles compared to lower-grade steels, making it the benchmark for mil-spec bolt construction.

Does the black nitride finish require any special maintenance or lubrication?

Black nitride (also known as QPQ or salt bath ferritic nitrocarburizing) creates a surface treatment that penetrates the steel rather than sitting on top of it, resulting in excellent corrosion resistance and a naturally slick surface. While the coating reduces friction and resists rust better than phosphate finishes, regular cleaning and light lubrication with a quality CLP or gun oil are still recommended to ensure optimal performance and extend the service life of your BCG.