User blog comment:Master Moridin/A (Potentially Unnecessary) Explanation for Inconsistent Ammo Count/@comment-25396609-20151107052518/@comment-24891101-20151107180605

This is the best explanation. In action movies, when people are shooting at each other and not stopping to reload, while using real types of guns, no one suggests that in-universe they have some manner of technology to sidestep the issue. The same applies here.