Gun control leads to total control which leads ultimately to ....
The problem with this kind of statement is that it is an absolute, and therefore of little value. Gun control CAN lead to that, Gun Control HAS led to that in the past in many places.
But the undecided don't usually look much further than what is currently around them, and it hasn't happened here, yet. They don't understand that it could. They don't believe that it can.
Likewise the "2nd Amendment right is there so we can overthrow a tyrannical govt" argument has no traction today, and the anti's have worked hard to convince everyone that anyone who espouses that "right" is a wackjob nut, and probably a ticking time bomb.
they are aided in this by all the wackjob nuts who are on "our side" who do push this argument. It may be true, but its not
relevant, today.
Here's a couple of points you can add to your ammo box of arguments, but they are specialty rounds, and you have to target carefully.
One is actual world history. But keep it simple. Simple like everywhere there has been genocide, one common factor is the people being killed don't have guns and the ones doing the killing do. Small point, but important, I think.
Another point, if you are dealing with someone who has their ability to reason is that the more laws you make, the more the legal system has to do, and the effort going into gun control isn't going into catching violent criminals.
If you are dealing with those who can only wrap their mind around soundbytes and slogans, one I always liked is "When seconds count, the police are only minutes away".
Another potential argument is the "law of the jungle". I like to apply a variation of this when they say "we'd be better off with no guns at all, (for anyone)..." etc.
If NO GUNS AT ALL makes you feel safe, you should feel totally safe inside a prison! There are no guns in there, at all!! What's that? Speak up!...oh..I see, you wouldn't be safe there? Why not? There's no guns!...etc...
So are guns REALLY the problem? Or just YOUR SCAPEGOAT for the evil people who use them???
for the "Nobody NEEDS" arguments, I like to point to the minimum wage. Nobody NEEDS more, its a govt standard, right? You need more? pfft, you're just greedy! etc.
These aren't going to convert the undecided, just a few examples of things meant to get them to THINK...with the hope that if they actually think about things, they'll see the anti's arguments for the lies they generally are.