I am a suburbanite single father that's waiting for all hell to break loose. When it does, it's not going to be pretty. I think we all know what I'm talking about. With that said, I'm looking to stock up with ammo and firepower. At present I own a 40 Baratta semi auto pistol, and a Mosburg 9+ one pistol grip tactical shotgun. I am looking to add a semi automatic rifle. Between all of the flavors available, is an AR 15 sufficient. By that, I mean At 1000 yards I can waste just about anything. I wasn't sure if I should move up from the standard 223/556 to a higher caliber? I realize it and low cost comes into play. I would be looking to have a minimum of six mags holding a minimum of 28 to 30. Also I would like to incorporate a medium grade scope, Possibly a 1 x 30. When it comes down to it, I don't want to have any doubts in my mind that this will do the job. Please keep in mind that price is a huge factor in my decision. I've seen the price ranges from $400 to $1800. I appreciate your time, and effort. I thank you in advance. Geo.