Mil-Spec M16 Bolt Carrier Group (BCG) - BCG556

AO Precision Mil-Spec M16 Bolt Carrier Group (BCG)

The AO Precision Mil-Spec M16 Bolt Carrier Group (BCG) is crafted to strict military specifications, delivering a durable and reliable component for your AR-15 build. The bolt is machined from Carpenter 158 steel and completed with a manganese phosphate finish for optimal corrosion resistance and performance. Every AO Precision BCG is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) to ensure top quality and reliability. With meticulous attention to detail, this BCG provides the toughness and functionality required by serious shooters.

Ideal for AR-15 and M16 platform users who prioritize reliability and rugged durability, this BCG is perfect for professional duty use, competition shooting, and recreational builds.

Features

• Mil-Spec Bolt Construction
• • Carpenter 158 steel bolt, heat-treated, shot peened, and MPI inspected for maximum durability
  • High-Pressure Tested (HPT) for quality assurance
• Precision Machined Carrier
  • AISI 8620 aircraft-quality alloy with a full-mass M16 profile
  • Hard chrome bore and stress-relieved construction for durability
• Durable Gas Key
  • 4130 chromoly steel with Grade 8 hardware
  • Properly staked and sealed with Permatex for consistent, leak-free performance
• Enhanced Extraction System
  • Manganese phosphate-coated 4140 steel extractor
  • Includes black extractor insert and Viton O-ring for enhanced reliability

Specifications

• Bolt Material: Carpenter 158 steel
• Bolt Finish: Manganese Phosphate
• Extractor Material: 4140 Steel, Manganese Phosphate
• Carrier Material: AISI 8620 aircraft-quality alloy
• Gas Key Material: 4130 Chromoly Steel
• Gas Key Finish: Hard Chrome (internal)
• Profile: Full-Mass M16
• Testing: High-Pressure Tested and Magnetic Particle Inspected

The AO Precision Mil-Spec M16 BCG offers uncompromised quality and durability, with a robust design meant to withstand high-stress environments. Built to meet the highest standards, this BCG ensures reliability shot after shot, making it a trusted addition to your firearm.

Upgrade your AR-15 build with the AO Precision Mil-Spec M16 Bolt Carrier Group and experience military-grade performance and reliability you can trust.