The club allows anything legal to shoot. Ie, mags made for pistols that fit other guns are legal.
Not sure what the course recommends.
TacTeacher here...
2 pistol and 5 rifle magazines. Run your fav .223 or 7.62x39 or whatever you want to use for the Zombies (hahaha)
Once you start running Glock 17 (for example) pistol and your KRISS (have I got that right?) Carbine that uses G17 mags, you can really foul yourself up on the mag changes under stress. Ask me how I know....
Clear as mud?