Cap Guns

I don't think these are very common anymore, but back in the 60's to early 80's they were everywhere.
These are all modern, but are pretty similar to what was around.

Made to look like a semi auto pistol, it is really an 8 shot ring cap revolver

You can see where it loads here.

This a cowboy six shooter cap gun, it also uses ring caps.

Another six shooter, this one uses roll caps.

8 shot ring caps. These were more expensive, but louder than roll caps.