-More variety in game choices and play styles
-expands the paintball market even more
-More guns for collectors
-Magazines would need to be made stronger to withstand reloading and dropping mags
-Magazines are not cheap and if played similar to pods it offers a higher chance of things being stolen
-There would need to be set guidelines on mag sizes and whats aloud
Magfed Speedball would help the sport to expand even more then it is now and offers more variable play styles. When the bow paintball marker was first released there was concern but all in all it made the sport more fun due to that challenges it presented. Paintball is all about having fun and for some different challenges make things fun. Instead of being able to spray 200 balls down field in 10 seconds it would encourage people to be more tactical while still spraying as much paint as possible. The aspect of how fast you could reload your marker would play a pretty big factor in each game but it would also add that real world feel to speedball and give players something else to practice.
As far as having a box mag why even allow it? If someone where allowed to bring a box mag on the field then they have a clear advantage to everyone else. Even if it were to one person each team. Part of magfed markers is the need to reload like a real weapon. A box mag would allow a player to just spray like a regular speedball match.