Over all you would be better off with a carbine or an AR then a shotgun. It's one thing in a home for a shotgun to be of good value but once your past the 25 yard mark the shotguns value starts to drop off. The further away you are the more it drops real quick. Now an AR with FMJ rounds will penetrate the walls of a home from end to end. A carbine with FMJ rounds will penetrate from the outside of the house and out the other end and keep on going. Yes it will out penetrate the AR round out to at least 100 yards. Myself and 39 other range officers along with the FBI range officers officers tried many different firearms and rounds to find out what worked and what didn't. On glass the 30 carbine deflected less then a 30-06 or a .223. When it came time to put some old cars out of their misery, the .30 carbine would go into the trunk and came out the grill if it didn't hit the engine block. Engine kept running. The .223 didn't quite make it past the rear seat in the cars. But the engine kept running. So one of the instructors said he had the answer. Loaded his M1Garand with 8 rounds of USGI AP. Started at 25 years and fired into the engine block. But the engine kept running in that old Ford Falcon straight six. His last shot was at point blank range but it did nothing to the engine. One of the instructors had a .458 Winchester and so he tried it out. That old Falcon finally met it's match and the block cracked with the first shot from five yards away. But the point is the out to 25 yards the shotgun is viable with double O buck. Past that and a 12 gauge slug is viable to 50 yards. Out to 100+ the carbine is viable and past that the AR 15 is viable. So it all depends on what your going to use your firearms for. But remember that the carbine will penetrate more out to a farther distance then most people realize. Could be good and could be bad.