The ModuLoader from Raven Concealment Systems (RCS) and Ares Gear is a shotgun shell carrier system. It allows you to carry shotgun shells on your shotgun like a side saddle, on your belt, or both at the same time.
The system utilizes Velcro backed panels with elastic loops. The Velcro allows them to be placed on a custom kydex belt panel or adhesive Velcro material that adheres to your shotgun receiver. This system allows the user to quickly and easily place a shell holder exactly where they need them. You could even carry extra shell carriers and swap them out as you deplete others.