Everything is modular, if you have enough the right pouch. This 1000 Denier Nylon pouch attaches to both fix or collapsible stocks on .223 or 5.56 rifles. It uses an adjustable hook and loop flap to keep your contents secure. The hook backing attaches to any Velcro surface so you can keep your gear where you need it. Holds an additional .223 or 5.56 mag.