Mitchell Defense ArmorLube Carpenter 158 bolts are engineered for precision, strength, and endurance. Built from Carpenter 158 - a premium, high-strength alloy known for toughness and corrosion resistance - these bolts are designed to perform flawlessly in the harshest environments. Every bolt is MPI and high-pressure proof-tested to ensure structural integrity before leaving the MD facility - guaranteeing that your rifle performs when it matters most.Precision-machined and performance-tested, the ArmorLube Carpenter 158 bolt is the heart of a dependable AR-15 platform. The ArmorLube coating minimizes friction, improves cycling consistency, and prevents corrosion in even the most punishing conditions. Combined with SP4 gas rings and a phosphate extractor, this bolt is purpose-built for extended service life, maximum reliability, and consistent headspacing across thousands of rounds. FeaturesArmorLube Coating: Reduces friction, enhances wear resistance, and delivers superior corrosio...