This was also in the mid 70s, and this one was a cap rifle faked up like a musket. I noticed there were two holes drilled in the thin steel barrel right in front of the lockwork, so, being young, stupid, and having access to firework powder, (I NEVER ever said I was smart), I put a small charge of firework powder down the bore, and a whole wad of caps on the lockwork...and it ignited the powder charge, which shot HUGE sparks up the twin holes. So, if I had blocked those holes and ignored every rule of safety, I could have actually ignited a charge in the barrel from a cap on the lockwork....FORTUNATELY, I had an attack of common sense. I still have this thing somewhere in the house, too.