AR15 5.56 BCG with C158 Bolt No by Aero Precision

Upgrade your AR15 rifle with a precision-engineered bolt carrier group designed for peak durability, consistent function, and combat-grade performance.

The AR15 5.56 BCG with C158 Bolt by Aero Precision is a full-featured, MIL-SPEC bolt carrier group purpose-built to deliver unmatched reliability and smooth cycling in AR15 rifles chambered in 5.56 NATO, .223 Remington, and .300 Blackout. Featuring a bolt made from Carpenter 158 steel, each unit undergoes rigorous high-pressure testing and magnetic particle inspection to ensure strength, structural integrity, and field dependability. Ideal for new builds or replacements, this drop-in BCG ensures your rifle is ready for high-volume use and adverse conditions without compromise.

Key Features and Benefits

• Carpenter 158 Steel Bolt: Shot peened, heat-treated, and manufactured to strict MIL-SPEC standards for strength and longevity

• HPT & MPI Tested: Every bolt is high-pressure tested and magnetic particle inspected to ensure flawless performance under stress

• Full-Auto Rated Carrier: M16-profile 8620 steel carrier for increased mass and reliability during rapid-fire or suppressed use

• Black Nitride Finish: Durable and corrosion-resistant coating enhances lubricity and eases maintenance

• Properly Staked Gas Key: 4130 steel gas key, staked to prevent loosening under recoil and prolonged use

• Chrome-Lined Interior: Carrier and gas key interiors are chrome-lined for smoother operation and fouling resistance

• Stainless Steel Firing Pin: Corrosion-resistant and hardened for consistent ignition reliability

• Drop-In Compatibility: Pre-assembled and ready to install in any MIL-SPEC AR15 upper receiver

• Made in the USA: Precision-manufactured to exact tolerances in the United States for quality you can trust

Specifications

Platform: AR15
Caliber Compatibility: 5.56 NATO / .223 Rem / .300 Blackout
Bolt Material: Carpenter 158 Steel (Shot Peened, MPI, HPT)
Carrier Material: 8620 Steel
Carrier Profile: M16 Full-Auto
Gas Key Material: 4130 Steel (Chrome-Lined, Properly Staked)
Firing Pin: Chrome-Plated Stainless Steel
Finish: Black Nitride
Weight: Approximately 11.6 oz
Dimensions: Standard MIL-SPEC BCG dimensions
Origin: Made in the USA

Usage Instructions

Apply appropriate lubrication before inserting into your AR15 upper receiver. Ensure firearm is unloaded and safe before installation. Compatible with direct impingement gas systems and all MIL-SPEC AR15 platforms.

Warranty

Covered by Aero Precision’s Limited Lifetime Warranty against defects in material and workmanship. Proof of purchase required. Warranty applies to the original purchaser only.

Why Choose This BCG

Built to military specifications, rigorously tested, and enhanced with modern finishes, this Aero Precision BCG delivers confidence with every shot. Whether you’re upgrading, building, or replacing, it provides the durability and performance serious shooters demand.