Arm or Ally 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt - Black Nitride
In stock
0.00087 
0.02654 
79.99000 
0.96373 
80.00200 
0.14568 Arm or Ally 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt – Black Nitride
Arm or Ally 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt – Black Nitride is designed for exceptional reliability, durability, and performance. Precision-ground and properly heat-treated, this full-auto M16 BCG is 100% made in America using the finest U.S.-sourced raw materials. Featuring a Carpenter 158 (C158) steel bolt, this BCG ensures long-term durability and strength, making it an excellent upgrade for any AR-15 platform.
The Black Nitride finish significantly enhances the BCG’s surface hardness, prevents corrosion, and increases wear resistance. Unlike traditional phosphate coatings that can chip or wear down, the nitride treatment bonds at a molecular level, ensuring a long-lasting, smooth, and low-friction surface. This finish also improves lubricity, reducing fouling buildup and making maintenance easier.
Since 2015, Arm or Ally has handled hundreds of thousands of bolt carrier groups and was the leading dealer of Toolcraft BCGs. Our experience has allowed us to carefully select top-tier U.S. manufacturers for each component, ensuring the highest quality standards. By removing unnecessary branding and premium packaging, we deliver a best-in-class BCG at an unbeatable price.
Whether you’re upgrading an existing rifle or completing a new build, this BCG provides a reliable and high-performance solution for serious shooters. Built to last and rigorously tested, it is an excellent investment in your firearm’s long-term functionality.
Features:
- 100% made in the USA using premium raw materials
- Full-auto M16 profile for enhanced durability and strength
- Carpenter 158 (C158) steel bolt for proven reliability
- Precision-ground and properly heat-treated components
- Black Nitride finish for superior hardness, corrosion resistance, and lubricity
- No coatings to chip or wear—nitride is bonded at the molecular level
- Hand-selected components from top U.S. manufacturers
- Backed by Arm or Ally’s expertise in high-quality BCGs
What is the Arm or Ally Brand?
Arm or Ally branded products are manufactured in the same facilities and to the same standards as many popular, high-end brands. Our promise to you is a high-quality product at a more affordable price—100% American-made products backed by the same defect-free warranty as every other product we offer.
...unless you like paying for their marketing and fancy packaging!
Product Information
| Manufacturer | Leading U.S. Manufacturer |
|---|---|
| Platform | AR15 |
| Caliber | 223 Rem, 300 Blackout, 350 Legend, 5.56 NATO |
| Carrier Material | 8620 Steel |
| Bolt Material | C158 Steel |
| Finish | QPQ Nitride |
| Color | Black |
| Compatibility | Standard AR15 components |
| Features | Heat Treated, MPI Inspected, Precision Ground, Shot Peened, FA Serrations |
| Made in USA | Yes |
| Weight | 11.52oz |
