Part 2
The Kruger is an actual sub-caliber firearm. It is a breech-loading single-shot, does not use an integrated cartridge, firing from an open bolt.
The operating knob is pulled back which retracts the breechblock, held by the trigger sear. A small pellet is inserted into the barrel, followed by a cap-gun cap (or as many of them as you can stuff behind the chamber!) Trigger-pull releases the breechblock, snapping the cap and expelling the pellet. As you can see here the caps are corrosive.
I have not fired this gun, as ammunition is no longer available. Actually I have never fired a projectile from one, but I can tell you that touching off a stack of caps puts a pretty impressive muzzle flash out of the barrel at night!
Impressive in appearance, the Kruger is actually nine-tenths scale, as can be seen compared here with a 1911 DWM. When I was eight years old it felt bigger.
--Dwight