I was at a customer's house recently and we started talking about guns.He showed me an unusual rifle his father-in-law had brought home from Europe during WWII.It was a Zimmerstutzen or parlor rifle.It uses a percussion cap to fire a small lead ball through a short barrel.The calibers ranged from 4mm to 5.5mm.I had never heard of this rifle before,but apparently it was used in indoor shooting matches sort of like darts matches are played.Also,this is still done in some places in the US and Europe.I just thought this was interesting and if anyone could tell me more about the Zimmerstutzen,please do.Thanks.