Upgrade your AR-15 platform with the Colt's Manufacturing Mil-Spec Bolt Carrier Group designed for 223 Remington and 5.56 NATO chambers. Engineered to Colt’s exacting military specifications, this bolt carrier group (BCG) delivers unmatched reliability, smooth cycling, and long‑lasting performance for tactical, competition, and defensive shooting.
Key Features & Benefits
- Mil-Spec Construction: Built to the same standards used by the U.S. military, ensuring durability under extreme conditions.
- Black Parkerized Finish: Corrosion‑resistant coating provides a matte black appearance that reduces glare and protects against harsh environments.
- Optimized for 223 Rem / 5.56 NATO: Perfectly machined tolerances for reliable operation with both commercial and military ammunition.
- Enhanced Bolt Design: Reduced friction and improved feed reliability for smoother cycling and increased round‑to‑round consistency.
- Complete Set: Includes bolt, bolt carrier, gas key, and firing pin, ready for immediate installation.
- Compatibility: Fits all standard AR‑15 lower receivers and upper assemblies that accept a mil‑spec BCG.
- Tested for Performance: Each unit undergoes rigorous functional testing to meet Colt’s quality assurance standards.
Technical Specifications
| Model | SP64028 |
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| Caliber Compatibility | 223 Remington / 5.56 NATO |
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| Finish | Black Parkerized |
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| Material | Aircraft‑grade aluminum and steel |
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| Length | Approx. 5.6 inches (overall) |
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| Weight | ~0.65 lb (295 g) |
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| Included Components | Bolt, Carrier, Gas Key, Firing Pin |
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Why Choose Colt’s Mil‑Spec BCG?
When you select the Colt's Manufacturing Mil‑Spec Bolt Carrier Group, you are choosing a component that has been trusted by professional operators for decades. The black parkerized finish not only offers a tactical low‑profile look but also provides superior protection against rust, moisture, and wear. This BCG is engineered to work flawlessly with both 223 Rem and 5.56 NATO ammunition, delivering consistent performance whether you are on the range or in the field.
Installation & Compatibility
Installation is straightforward for anyone familiar with AR‑15 assembly. The bolt carrier group fits standard mil‑spec upper receivers without any modification. For optimal performance, we recommend pairing the BCG with a compatible Colt or Mil‑Spec gas system and a quality barrel tuned to your intended ammunition.
Customer Reviews
"The smoothness of the cycle is unmatched. I’ve run countless rounds with no signs of wear—Colt never disappoints."
– Tactical Shooter, USA
"The black parkerized finish looks great and has held up perfectly after months of use in humid climates."
– Competitive Shooter, Canada
Frequently Asked Questions (FAQ)
- Is this BCG compatible with 5.45×39mm rifles?
- No. This bolt carrier group is specifically engineered for 223 Remington and 5.56 NATO chambers.
- Can I install this BCG on a lower receiver that has been previously milled?
- Yes, as long as the lower maintains standard mil‑spec dimensions, the BCG will function correctly.
- Do I need to break in the BCG?
- Colt’s mil‑spec BCG is ready for immediate use, but a short period of normal operation will ensure all parts seat perfectly.
Order Your Colt Mil‑Spec Bolt Carrier Group Today
Enhance the reliability, durability, and performance of your AR‑15 platform with the Colt's Manufacturing Mil‑Spec Bolt Carrier Group. Whether you are a law‑enforcement professional, competitive shooter, or dedicated hobbyist, this BCG provides the precision and confidence you need to excel.
