Sierra One™ includes an AR15 style six position folding and collapsible stock and an AR15 style shroud with four Picatinny rails for customization. This marker features a realistic appearance and comes with a high performance 11" quick thread barrel, removable and adjustable front and rear sights, a stainless steel gas line, and proven high performance in-line bolt system. Compatible with 98 Custom® Response® Trigger and Flatline® Barrel.