The AR-STONER(TM) 458 SOCOM Barrel provides high performance and accuracy for the 458 SOCOM round. Manufactured from 4150 Chrome Moly Steel, this 1:14" Twist, 16" heavy contour barrel barrel gives you high quality at a great value. Additional features include a carbine-length gas system, M4 feed ramps, and a 5/8" - 32 threaded muzzle. The barrel extension and locator pin are both included and installed at the factory.FeaturesChambered in 458 SOCOM1 in 14" TwistHeavy Contour4150 Chrome Moly SteelPhosphate Finish