You seem to think that making AR15s illegal would be legal.
Just a hypothetical example to illustrate a point. I understand the doubt that you raise in the case of the US regarding particular types of gun and the move to ban or limit them.
You are more of a gun expert than I, Dennis. What long barrelled gun would you suggest for reasonable defensive use around the home land to supplement a hand gun?
I had in mind a .22 Ruger or CZ but today handled a couple of Remington pump action shot guns. One of those might be a better deterrent than a .22, provided that my wife could also manage it. Rather nice to handle too. Made me feel like an old time London bank robber except that they weren't sawn off! The cost would be about the same as for a .22 but the ammunition would probably be more expensive.
Would a shotgun be more suitable?