This is an antique, German combination gun (according to the OP) that appears to have several gauges of ammo, like a rifle, shotgun, and pistol bullets. The flourish designs on the gun are beautiful as well.
Not just happiness. I hate when people say happiness, when they mean many other things. Happiness isn't everything; this experiment is still true for those who realize that seeking only happiness is shallow. Help others, and you gain much deeper things.