Kaw Valley Precision 9MM Barrels are button rifled out of 4150 CMV Steel, QPQ Salt Bath Nitrided, with an 11-degree target crown for the best accuracy and durability possible. KVP 9MM barrels have an integrated feed ramp and will work with both Colt and Glock style AR-9 rifles or pistols. All barrels are manufactured under ISO:9001 & AS:9100 quality certifications. FeaturesBarrel Type: Button RifledBarrel Profile: Light (.675" at the thinnest cross-section)Inside Finish: Black QPQ Salt Bath NitrideOutside Finish: Black QPQ Salt Bath NitrideBarrel Extension: AR15 (Will work with any Milspec AR15 Upper Receiver)Integrated feed rampDesigned to work with both Colt and Glock style AR-9 builds11-degree Target Crown