The Norsso Volcano Rail XP Slide & Barrel Set includes Volcano Rail XP Slide and one Norsso 3.7" 9mm Bull Barrel. Both parts are machined from 17-4 PH Stainless Steel. FeaturesKnurl-style, textured pockets for tactile feel and gripHandguard style lightning ports on all three sidesLarge volcano end port providing the furthest possible distance from fulcrumTwo expandable C ports for additional porting capabilityNew, Spear Point style fluting down Volcano Bull Barrel shoulder lengthLarger barrel bore only compatible with Norsso N365XL Bull BarrelsMultifaceted contoured front and rear corners