The Tippmann Sierra includes an AR15 style six position folding and collapsible stock and an AR15 style shroud with four picatinny rails for customization. This marker comes with a high performance 11" quick thread barrel, removable and adjustable front and rear sights, and proven high performance in-line bolt system. Compatible with 98 Custom Response Trigger and Flatline Barrel. Features Include: 11" Quick thread anodized barrel Removable/Adjustable front and rear sights Front sling mount Durable all aluminum die cast receiver Quick release feeder elbow AR15 style shroud with four built-in picatinny rails AR15 style magazine w/built-in tool storage Heavy duty stainless steel braded gas line Under 3lb. trigger pull for smooth, steady shots AR15 style 6 position collapsible and folding stock - adjusts to your game