From Snipers Hide:

"Vortex Viper PST Riflescopes

***Vortex Viper PST Riflescope Update***12-21-2010

Vortex is excited to announce that they are preparing to ship some of the long-awaited Viper PST riflescopes beginning the last week of December.

Although this first shipment will consist of mainly 1-4x24 models, small amounts of other configurations will be shipped out also. Vortex expects the variety of available models to quickly ramp up over the next few weeks—and to have a steady stream throughout the new year."