This Mercury Precision 7.5" "Pod" Barrel Is Chambered In 5.56 NATO And Is Made From 4150 CMV And Has Super High-Quality QPQ Black Nitride Finish And Is Equipped With A Stainless Steel Barrel Extension. This Treatment Increases The Barrel's Hardness Significantly And Makes It Extremely Corrosion Resistant. This Barrel Comes With A 1:7 Twist Rate, Features A 1/2x28 Thread Pitch. This "Pod" Barrel Is Precision Machined To A Medium Barrel Profile To It Is Light Enough To Pack Around And Stable Enough To Stay On Target.