Fits both fix stock or collapsible M-4/M-16 stock. Adjustable velcro flap. Hook backing attaches to any velcro surface. Holds one M-4/M-16 mag. Size: 7.25" L x 3.25" W x 1.5" D The color of this item is shown in the main photo of the listing and mentioned above. Other photos are to show the features and may be in a different color.