For anyone who thinks that an AR-15 is a bad choice for home self-defense...
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...please realize that while it LOOKS evil, it shoots a very, very tiny bullet (5.56/.223 caliber), that while deadly (of course), has a tendency to not penetrate house walls to the same extent as other guns.
Depending on the type of ammunition, shotguns, other rifles, and indeed many pistols, all have the possibility of passing through numerous walls...the AR-15 actually has a much better chance of not hitting unintended targets.
In addition, the AR-15 rifle has extremely low recoil and is very easy to handle, making it a good choice for those of smaller stature, those with disabilities, elderly, children, etc.
Contrary to public opinion, the AR-15 is not somehow 'more deadly' than any other firearm. In fact, if trained properly in its use, an AR-15 can actually be one of the best home defense options.