I'd have to agree with the majority here. If you don't want 20 round mags, no one is forcing you to have them, sell them. I like my 30 round mags. A 100 round drum, too bulky and prone to jams from what I hear, so I have none. I've shot 30 round mags, lots of fun at an outdoor shooting range. Home Defense weapon, (that's not an AR-15) Shotgun of any gauge will do just fine indoors with a variety of loads. My choice is a Mossberg 500 pump 20 gauge with Hogue Tamer pistol grip and #4 Buck.