The Tracker Safe PG563 is a must have safe accessory. It can hold multiple pistol magazines and AR style magazine. It can be placed anywhere there is carpet; i.e. back of safe doors, inside walls of safes, cars, trucks, etc. Keep your pistol/AR magazines and any other items ready and organized with the Tracker Safe PG563. The PG563 pocket is constructed of strong durable nylon fabric on the front and the back is fully covered in Velcro. In the center is a thick plastic core that gives the PG563 its rigidity. The pocket has an elastic drawstring around the top of the pocket that is secured with a barrel cord lock. This cord allows for some adjustment to keep items in place. The PG563 also is supplied with a removable plastic insert that lines the bottom and sides of the interior. This liner provides support and structure for heavier items. Please test your safe's carpet for compatibility with Velcro.