The KAK AR15 Bolt Carrier Group (BCG) for 5.56 NATO and .300 Blackout is a rugged, duty-ready component engineered for reliability, durability, and consistent performance under demanding conditions. Featuring a chrome-lined phosphate finish, this full-auto M16-profile bolt carrier group combines military-proven materials and manufacturing processes with modern quality control standards to deliver dependable operation across a wide range of AR-15 platforms.

Built around an M16 auto-profile carrier machined from aircraft-grade 8620 steel, the carrier is properly heat treated, precision ground, chrome lined, and finished with a durable phosphate coating for enhanced wear and corrosion resistance. The bolt is machined from a single piece of premium 9310 steel, heat treated, shot peened, magnetic particle inspected (MPI), and phosphate finished to ensure long-term reliability and strength.

The chrome-lined gas key is precision staked using a hydraulic staking process to ensure proper retention under hard use, while the enhanced one-piece billet extractor improves extraction reliability in adverse conditions. Combined with an S7 tool steel ejector and extractor retaining pin, this BCG is designed to withstand high round counts and demanding firing schedules.

Whether you're building a duty rifle, defensive carbine, training rifle, or .300 Blackout setup, the KAK Chrome-Lined Phosphate BCG delivers the durability and reliability serious shooters expect.

Features:

• Compatible with 5.56 NATO, .223 Remington, and .300 Blackout
• Full-auto M16 carrier profile
• Aircraft-grade 8620 steel carrier
• Premium 9310 steel bolt
• Chrome-lined carrier interior
• Chrome-lined gas key
• Phosphate exterior finish
• Shot peened bolt
• MPI (Magnetic Particle Inspected) bolt
• Enhanced one-piece billet extractor
• Precision hydraulic gas key staking
• S7 tool steel ejector and extractor retaining pin
• Chrome-plated firing pin
• Corrosion and wear-resistant construction

Benefits of Chrome-Lined Phosphate:
The combination of phosphate coating and chrome lining provides exceptional corrosion resistance, reduced internal wear, easier cleaning, and long-term reliability. This proven finish combination remains a top choice for duty rifles, defensive carbines, and hard-use AR platforms.

Perfect For:

• AR-15 rifle builds
• Duty and defensive carbines
• Training rifles
• .300 Blackout builds
• High-round-count shooting
• Reliable replacement bolt carrier groups