I also had one of these:
I wish I still had it: it's reportedly worth quite a bit if in good condition.
Loved to have had one.
Man, I had Creepy Crawlers and one of those guns too. I had the best toy rifle in the neighborhood because of that one. We used to dip caps in our go-kart’s gas tank and then hit it with a hammer too. Our playground’s were made out of concrete and asphalt and our parents had no idea where we were for most of the day. Awesome stuff.