Here is a link to a post by USMC03. https://www.m4carbine.net/showthread.php?t=4209 I thought it was a sticky. I had a tough time finding it. I think USMC03 brings up some of the points shared by the irons only crowd here in this post. Below is USMC03’s info:
[i]"By self defense, I’m going to guess that the place you are most likely to use an AR15 is in defense of your home.
For a home defense carbine I would suggest a simple carbine with [b]iron sights[/b] and a [b]white light[/b]. This is not the "coolest" answer, but it is probably one of the most practical.
Most guys don’t deal with violent criminals on a daily basis and often times on the internet posts like this often generate more responses that are based on “theory” rather than responses that closely follow circumstances that a armed civilian is likely to find himself in.
That being said, I see a lot of threads like this, and most of the responses are based on theory and [b]best case scenerios[/b]. Any fighter (boxer, soldier, cop, civilian defending themselves) should always train for the [b]worst case[/b] scenerio, [b]not[/b] the best case. As the saying goes, prepare for the worst, hope for the best.
If as an armed civilian you are unlucky enough to be the intended victim of a violent crime, you are most likely going to be involved in a defensive or reactive fight, not an offensive fight. The criminal, much like an animal of prey will pick the intended victim, the date, the time, and the place for the attack.
As a victim of a violent crime, you will almost always find yourself dealing with the situation on the criminals terms. You will be reacting to his actions. As is proof in the OODA loop, actions are always quicker than reactions.
If a criminal kicks in your front door to committ a home invasion robbery, he isn't going to sit in the front living room like a prom date and wait for you (the victim) to turn on your optic, put on your multi-cam plate carrier, and get ready for the fight. He is there it dominate you and to control you and to get what he wants (steal something of monitary value, take a human life, exact revenge, etc) In most cases you are barely going to have enough time to roll out of bed and grab your gun (much less turn on an optic, mess with a sling, insert a mag and chamber a round, etc) before the bad guy is in the same room as you. Crimes like this happen VERY quickly."[/i]