I was thinking much the same thing.
He could sell the AR today for double what he paid for it and gone back and bought four shotguns for free.
That said the AR is an excellent weapon for home defense. Better than any handgun or shotgun really. A lot more pricey than a shotgun and very pricey these days. There is no magic required in learning how to use them either.
Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday.