I do remember K mart selling guns and amo , I did think it odd even at 10 years old or so.
My dad bought me an air rifle from a pop up disposal store in one of the old woolstores in tennerife QLD.
Me and a friend in time eventually took aim at a neibours classic model boat floating in there pool , it was pretty accurate over 50 metres or so eventually we pummeled enough holes into it
the bow slowly rose and it sunk to the bottom .. I still remember this with a smirk sorry it just looked so kool
A short while later with a major kick in the arse my slug gun also dissapeared
forever more.
In hindsight guns fireworks and children probably arnt the best of ideas.