I have always said that when it comes to AR-15s, if you can think of it someone else has already made it and most likely marketed whatever you are thinking. This overabundance of stuff and accessories for the most popular firearm in the US can lead to confusion when it comes to your home defense carbine.
I know deep down in my soul, without a shadow of a doubt, that lawful gun ownership has nothing to do with gun crime. You probably agree.
Crime in these United States is down. Down and falling. Crime has been steadily falling since 1993 or so.