Product DescriptionThe Ballistic Adv Performance Series BA Hanson barrel is built for AR-15 platforms chambered in 5.56x45mm NATO and crafted from durable 4150 Chrome Moly Vanadium steel with a black QPQ corrosion-resistant finish. Designed around the BA Hanson profile, this 14.5-inch barrel features an extended M4 feed ramp barrel extension with Nickel Boron coating to support reliable feeding. It is configured for a low-profile gas block setup with a 1.03-inch gas block seat sized for .750-inch gas blocks, and it includes a pinned low-profile gas block. Hanson barrels are not designed to work with aftermarket piston kits.Product Highlights 4150 Chrome Moly Vanadium steel construction with black QPQ corrosion-resistant finish BA Hanson profile with included pinned low-profile gas block for a streamlined AR-15 build Nickel Boron coated extended M4 feed ramp barrel extension for enhanced feeding reliability Midlength gas configuration with 1.03-inch gas block seat for .750-inch low-profile gas blocks Threaded muzzle (1/2x28) and 1:7 twist rate suited for a wide range of 5.56 NATO loadsSpecs Brand: Ballistic Adv Manufacturer Part Number: BABL556008F UPC: 819747020734 Platform: AR-15 Caliber: 5.56x45mm NATO Barrel Length: 14.50 in Series: Performance Series Profile: BA Hanson Material: 4150 Chrome Moly Vanadium (CMV) steel Finish: Black QPQ Feed Ramps: Nickel Boron coated extended M4 feed ramp barrel extension Gas System: Midlength Gas Block Seat: 1.03 in (for .750 in low-profile gas blocks) Gas Block: Pinned low-profile gas block included Twist Rate: 1:7 Muzzle Threads: 1/2x28Disclaimer: 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.