Use only 7 rounders AND fit a compliant stock. Once you have your (whats now termed) "General E Endorsement" and also a "Specific E endorsement" for that particular rifle then g for your life with the 30's.
Big mags are overrated, get in the way and once you have done a couple of mag dumps you get bored wasting ammo. Even the 100 round drum mags are the same.
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