Product DescriptionThe Geissele Automatics 16 inch 5.56 NATO rifle barrel is built for shooters who demand durability, consistency, and dependable performance from their AR-15 platform. Precision-machined and cold hammer forged from high-quality Chrome Moly Vanadium steel, this heavy profile barrel is designed for hard use, competition, and duty applications. Its chrome-lined bore helps promote long service life and easier maintenance, while the 1:7 twist rate supports a wide range of common 5.56 projectiles. Geissele also subjects this barrel to High Pressure Testing and Magnetic Particle Inspection to help ensure reliability and quality.This barrel features a Geissele-length gas system, a .750 gas block diameter, a .075 gas port, and an M4 barrel extension. Additional details include a 1/2x28 thread pitch and a manganese phosphate finish in black, making it a strong choice for a premium AR-15 build or upgrade.Product Highlights 16 inch cold hammer forged 5.56 NATO barrel built for AR-15 rifles and demanding use Chrome Moly Vanadium steel construction with chrome-lined bore for durability and service life Heavy profile design with Geissele-length gas system for stable, dependable performance High Pressure Tested and Magnetic Particle Inspected for added quality assurance 1:7 twist rate, .750 gas block diameter, M4 barrel extension, and 1/2x28 muzzle threads Specs Brand: Geissele Automatics Manufacturer Part Number: 05-3113 UPC: 810081135368 Product Type: Rifle Barrel Platform: AR-15 Caliber: 5.56 NATO Barrel Length: 16 in Construction: Cold Hammer Forged Chrome Moly Vanadium Steel Lining: Chrome Lined Profile: Geissele Heavy Profile Gas System: Geissele-Length Gas Block Diameter: .750 in Gas Port Size: .075 in Twist Rate: 1:7 Barrel Extension: M4 Thread Pitch: 1/2x28 Inspection: High Pressure Tested (HPT), Magnetic Particle Inspected (MPI) Finish: Manganese Phosphate Color: Black Manufacturing Facility: North Wales, Pennsylvania Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.