BT Combat Player's Pack, Includes BT Combat Marker, Overdrive DB Loader, Premier Single Goggle & Adjustable Combat Stock, BT Combat Marker, Slide-Away Feedport For Easy Cleaning & Maintenance, Adjustable Vertical Front Grip, Selecta-Barrel Adapter Allows Use Of Multiple Barrel Threads, Modular Trigger System, Dual Picatinny Mounting Rails That Meet Military Standard 1913 & Tournament Legal External Velocity Adjuster, Boxed.