I have the same Vortex Viper PST gen2 5-25 scope. I will say that after zeroing the scope, it's a royal PITA to set the turret cap back on. Screwing the 3 little set screws in without the turret drifting on you is damn near impossible.i am just confused quite a bit with this. scope is vortex pst2 5-25x, so, presumably its turrets should be accurate.