Obsidian Arms M16 Bolt Carrier Group Phosphate 5.56 - OA-M16-BCG-P-556-N

Enhance your AR-15’s performance with the Obsidian Arms M16 Bolt Carrier Group Phosphate 5.56, a mil-spec masterpiece engineered for unwavering reliability in high-stakes scenarios. Whether you’re a competitive shooter, home defender, or tactical enthusiast, this BCG delivers the smooth cycling and durability you demand from your rifle, ensuring every round counts without compromise.

Key Features

• Mil-Spec Construction: Crafted from premium 8620 steel carrier and 9310 steel bolt, shot peened for enhanced strength and fatigue resistance, making it ideal for full-auto rated applications.
• Phosphate Finish: The classic manganese phosphate coating provides superior corrosion resistance and excels at retaining lubricants, even in harsh, dirty environments—perfect for maintaining peak performance during extended range sessions or field use.
• Enhanced Components: Includes a black O-ring insert on the extractor for improved grip on casings, an upgraded AR-15 firing pin, and a robust cam pin to minimize wear and ensure consistent operation.
• Chrome-Lined Interior: The carrier’s chrome-lined bore and properly staked gas key promote smooth gas flow and reduce friction, solving common issues like carbon buildup and unreliable extraction.

Technical Specifications

• Caliber: 5.56x45mm NATO
• Profile: M16 (full-auto compatible)
• Weight: Approximately 11.6 oz
• Material: 8620 alloy steel carrier, 9310 bolt (HPT/MPI tested for quality)
• Finish: Manganese phosphate exterior; chrome-lined carrier and gas key
• Includes: Complete assembly with bolt, carrier, firing pin, cam pin, retainer pin, and extractor

Why Choose the Obsidian Arms Phosphate BCG?

In a market flooded with flashy coatings, the phosphate finish stands out for its battle-proven toughness. It addresses key pain points like rapid wear in adverse conditions and inconsistent cycling by holding onto essential lubrication longer than slicker alternatives. This BCG isn’t just a part—it’s a reliable upgrade that boosts your rifle’s longevity and accuracy, giving you confidence in every trigger pull. Unlike premium coated options, it offers exceptional value without sacrificing military-grade standards, making it the go-to for budget-conscious builders seeking professional results.

Ready to elevate your AR-15 build? Add the Obsidian Arms M16 Bolt Carrier Group to your cart today and experience the difference in reliability and precision.

Frequently Asked Questions

Q: Is this BCG compatible with standard AR-15 rifles?
A: Yes, the M16 profile ensures full compatibility with AR-15 platforms, including semi-auto builds, while being rated for full-auto use.

Q: What makes the phosphate finish beneficial?
A: Phosphate provides excellent corrosion protection and lubricant retention, ideal for dirty or wet environments, ensuring smoother operation over time.

Q: Does it come fully assembled and tested?
A: Absolutely, this complete BCG is magnetic particle inspected (MPI) on the bolt for defect-free performance right out of the box.