Re: Sightron or Leupold
I have never owned a Sightron so I can't speak about them. I have used many Leupold scopes at work and its what I choose to use on my own rifles. I recently sold one of my SFP MK4's and replaced it with a MK4 ER/T 8.5-25X50 M5 TMR, but I won't be able to tell you how it performs until I get home in another 3 months.
Conventional wisdom here will be to save your pennies and get a Nightforce, USO or S&B, they all excellent scopes. I like the USO's best personally, but they are all more expensive. I have had good luck with Leupold scopes and I can get them substantially cheaper than I can get the other three.I still see a USO in my future, but I keep finding other things to spend my money on in the meantime.
If you have any issues with your Leupold scope, Leupold will fix it regardless of where you bought it or if it was used or new. I would call Mike at CS Tactical. He give you an unbiased educated opinion should be able to point you in the right direction,without having to deal with the "fan boys" or "haters".