Q Light Profile Barrel Assembly 5.56x45mm NATO 1-7 Twist 12in ACC-MNF-BRL-5.56-12. COMMON FEATURES & SPECS MATERIAL: Stainless Steel 416R RIFLING: Single Point Cut Rifling MUZZLE: 1/2-28 Tapered Muzzle FINISH: Bead Blasted Matte Finish...