Thanks for the warm welcome in the intro section! I hope it is ok if I jump in with a total newbie question! I am looking for a home defense shotgun. I have 3 very young children. I am pretty sold on the Mossberg 500... I held it in the store, I liked it, I see a lot of good reviews on it... But I dont know what to get - a 20 gauge? a 12? What is the .410? And I read so many places that buckshot is the right thing to use, but maybe it penetrates walls too much and I should use something else? I would so appreciate any advice. Keep it simple - its all new to me! Thanks guys!