Let's face it, the only reason people want to keep their high capacity magazines and military style weapons is because they're cool
Any suggestions on how to counter this?
Well, there is one counter, but he won't buy it. And that would be the truth. We do think they are cool. We do like them. They don't. All they see is the misuse, and so would ban fire, because it can burn.
Personally, I think it is an infringement of my right of free will and free choice to own what I want.
Leave aside, for the moment, the entire argument about our natural right to self defense, and our political right to resist tyranny, valid though they certainly are.
I don't believe its right for someone else to decide on what kind of gun I might own, what art I put on my wall, what books are on my shelf, or what music I listen to.
And I believe it is doubly wrong for someone to take that decision away from me, via legal means, using what
someone else might do as justification.
Pick something your friend likes, and tell him to ban it, as well, because of the deaths "caused" by them. And don't worry, there is virtually nothing that hasn't been used, abused, or misused to cause some deaths.
Golf clubs? SUVs? swimming pools, I'm sure someone has been killed with a coffee mug.
he won't allow the logic, after all, these things aren't guns, which he recognizes as "designed to kill". As if that somehow magically makes them more than any other inanimate object.
If he can't get past that, other logic will be hard for him to accept.
you may now return to the regularly scheduled discussion of self defense and the 2nd Amendment rights.