The GG&G Mossberg 590 Side Saddle and 500 Side Saddle Shell Holder enhances the ease of loading both the mag tube and the chamber. It's specifically designed for compatibility with short tactical forearms. If a shotgun has longer sporting forearms they must be replaced before installing the Mossberg Side Saddle. Installation requires no modifications to the weapon thanks to its construction from 6061-T6 aluminum and a non-marring backing plate.