The Taurus 22TUC
The 22TUC is the third generation of Taurus tip-up pistols. The first generation was all-metal; the second generation introduced a polymer frame; and the 22TUC still uses a polymer frame but goes in a different direction. Someone decided the Taurus tip-up needed a revamp, and they did.
The Taurus 22TUC - Pocket Pistol Redefined
The 22TUC is the revamp of the Taurus PT22 series of tip-up pistols. It is a bit radical in its redesign, but oh-so-much better.