Product DescriptionThe Ballistic Advantage Performance Series BA Hanson Mid-Length barrel is a compact, hard-use 5.56x45mm NATO option designed for AR-15 builds that prioritize reliability and durability. This 13.7-inch barrel is machined from Chrome Moly Vanadium (4150 CrMoV) steel and finished in a black QPQ corrosion-resistant treatment for enhanced wear protection. It features a Nickel Boron coated extended M4 feed ramp extension to promote smooth, consistent feeding under demanding conditions.Product Highlights 13.7-inch 5.56x45mm NATO BA Hanson profile barrel for AR-15 platforms Chrome Moly Vanadium (4150 CrMoV) steel construction with black QPQ corrosion-resistant finish Nickel Boron coated extended M4 feed ramp extension for improved feeding reliability Mid-length gas system for a balanced recoil impulse and dependable cycling Threaded muzzle (1/2x28) and 1:7 twist rate for modern 5.56/.223 projectile stabilizationSpecs Brand: Ballistic Adv Manufacturer Part Number: BABL556036F UPC: 819747020833 Cartridge: 5.56x45mm NATO (also accepts .223 Remington) Barrel Length: 13.7 in Gas System Length: Mid-length Profile: BA Hanson Material: 4150 Chrome Moly Vanadium (CrMoV) steel Finish/Color: Black QPQ (corrosion resistant) Twist Rate: 1:7 Muzzle Threads: 1/2x28 Feed Ramps: Nickel Boron coated extended M4 feed ramp extension Testing: High Pressure (HP) and Magnetic Particle Inspected (MPI) Gas Block Journal: 0.750 in (low-profile gas block seat) Included/Notes: Pinned low-profile gas block (per supplemental listing data) Weight: 25 oz (per supplemental listing data) Platform Compatibility: AR-15Disclaimer: 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.