Originally Posted by RudyCakes
I've only got one pre-ban 30 rounder, so I still probably wouldn't do well in the class.
While the BB is more of a hinderance/detriment to training, 10 round magazines are not as much. You'll get more practice reloading if nothing else which isn't all bad. Just bring more 10 round mags to the course loaded and ready to go to keep things moving.
Also you might find that some of the other students may loan you 20/30 rounders (as long as your rifle is compliant) to use in the course.