I know how to use it. I hit them with it. That way I get an absolute guaranteed result.
No, you don't. If you did, then every person with a club with have a "guaranteed result" which is clearly not true.
If you think you will reliably fire a weapon you have just found. Then good luck with that.
I've handled literally hundreds of different gun models over the last 40 years or so. There's never been a single one that I had to 'puzzle out' how to fire.
They're just not that complicated.