You're kidding, once again. . . . . . . right? Here, you want to quote the box O' truth, here's results. 12 pine boards (keep in mind, tougher than sheet rock) didn't stop a .223 round.
Here's the link for the rifle/handgun testing - http://www.theboxotruth.com/docs/bot1.htm
Here's the link for the shotgun testing -http://www.theboxotruth.com/docs/bot3.htm
Not to mention, I
highly doubt an intruder is going to be wearing body armor on a regular B&E.
The average for shots fired in a home defense scenario is 2. Unless you plan on going to war with a gang, 30 round clips are completely unnecessary. If you can't hit your intruder within a few shots at point blank range, you shouldn't even own a gun because that clearly shows you don't devote the time to practice.
And finally, a silencer is also completely unnecessary. You'll only get a couple shots off, and you know **** well you'll have fired more than a couple bullets at the shooting range before this hypothetical scenario.
Please, just stop already before you put your foot further into your mouth. There is no real justification in using an AR-15 for home defense unless you live out in the boonies.