I posted this four years ago. Presently a Nikon scope is a crapshoot since the have reneged on their lifetime warranty and no fault warranty. They are decent scopes, but if in need of repair you're out of luck!11, my son's pal just bought a Nikon Prostaff 7, don't recall the power. I looked through this scope and was impressed. Your 2.5X10X50 #16320 is on sale at Opitcs Planet $329.95 free shipping. There are a ton of positive posts on this forum of Nikon's great customer service. I have several Nikon scopes of various models and they all hold turret settings very well.