Well, at the moment I have 3 10 round magazines and I am getting very fast at magazine changes. If you can’t have larger mags, you have to learn to change fast.
Wow! How fun would that be to have?! I have a 20 round magazine for my Ruger Mini-14 which has been “owned in California prior to January 1, 2000” but it’s so expensive to shoot .222 (yes, that’s correct) ammo that I rarely take it out.