You need a Bug-A-Salt. Probably the most fun I've had for $40 this summer.
I do have a BUG-A-SALT rifle. However, let me say this for everyone else that doesn't yet have one. That do an amazing job on typical house flies for sure. And I do have to say it is really fun shooting those flies. You really don't have to get too close either. One shot usually kills typical house flies on the spot.
BUT, since those BUG-A-SALT rifles use table salt as their bullet material, the salt will absolutely corrode any metal it falls on. I used my Bug-A-Salt in my shop killing flies for lots of fun not even thinking about the SALT. And a few months later every metal table on all my wood-working power equipment had salt corrosion on them. Once I seen that, I haven't shot any flies. I have to clean all the cast iron table tops and sand them to smooth surfaces again and then some paste wax. :faint2:
I did something equally stupid a few years ago as well. I etch a lot of PC boards for the circuits I design and build. Therefore built an etching tank with heater and an air pump for the bubbler system for the Ferrite Chloride etching solution. And with that etching tank, it was producing etched boards in less then a few minutes.as well.
SOoooo I made the stupid decision to just let the etching acid in that etching tank, so all I had to do was turn it on and go. Well little did I know at the time was Ferric Chloride gives off acid fumes constantly. Unless it is in an air tight container, those acid fumes will be emitted non-stop. And I stored that etching tank in a cabinet in a plastic tub waiting for the next time I need it. Months later every metal item in the cabinet was very corroded indeed. I mean really bad too! The ended that stupid idea. I seem to learn things sometimes the hard way... :cold:
So the Bug-A-Salt rifle was a present that is fun to shoot, but be careful where you shoot it! :facepalm: