Vortex Viper PST 1-4x24 being used on the 15-22 here.
Maybe a bit of overkill for a .22LR rifle but it was a leftover from the SR556 that got a Vortex Crossfire II 4-12x42 upgrade.
I've been very happy with the Vortex line. Good quality glass for a very reasonable price. Combining the glass quality with the lifetime warranty makes for a great deal in a low to mid-priced optic.