I used to have a similar toy as kid. It didn't use actual caps, but it did have that nifty bolt-action. When you pulled the trigger, it would jerk like recoil in your grip.

I also remember having both silver and black cap guns that were alarmingly real looking (albeit smaller scale than actual guns).

Personally, I'm far more enamored with clever toy guns than real ones. The animation company I used to work at suffered a spate of Nerf-related violence a few years back when wediscovered a line of toy guns which fired suction-cup-tipped foam darts from plastic "shells", which could be ejected. The double-barreled shotgun would fire two shits, then eject the plastic shells when you popped it open. After that came the big plastic M1a Springfield types, which fit 6 shots into a clip, and ejected spent shells out the side. Remarkably accurate too, and made for an awful lot of work-preventing fun. :)

Had quite the arsenal by my desk by the end.