Lots of ink has been spilled on this subject, yet it remains an intangible. It's the "art" part of gunmaking that escapes most gunmakers. Very few mass-produced guns can make the claim. Hard to define and hard to describe, yet very real. I tend to associate the concept with lightweight game guns, but there's no reason a target gun couldn't have it as well. Darn subjective and hard to measure (although there are MOI machines out there), my first exposure to the concept was a 1920s LC Smith featherweight in 16 that my father, brother, and I fought over because it felt so good and worked even better. The last one that struck me that way was an mid-1890s Boss light 12. FWIW: most of the 2-inch 12s that I pick up seem to have it as well.