The Muggle Way
When you first suggested it, they all laughed at the idea of using 'Muggle stuff!'. All of them, except for Hermione. She just looked at you with her dark eyes and nodded slightly. No other words were needed.
Where did she get it from? You don't know, don't want to know what she did to get it, instead you just grasp it in your hands and feel it pulse. It's pressed against Voldemort's pale throat, and he's laughing, laughing because he's forgotten what guns look like and he thinks you've got a bit of metal and what use is metal in the world of wands and you want to close your eyes but you know you can't and you squeeze and –
Magic said that you had to kill or be killed. Magic killed your parents and magic twisted everything upside-down. Magic made the whole mess.
So you decided to do it the Muggle way.
And guess what? The Muggle way works just as well.