Can anyone tell me what you folks use? I have a Leupold Mark 4 10X M3 with a 40mm OBJ. I just want proper clearance for my AR. Thanks in advance.
Best bet would be a set of high rings....not from personal experience but from what I've seen on the range.
Most likely it wont effect you eitherway with 10X glass, you wont even see the front sight.
I opted to replace the Front sight with a low-profile gas block as I used to alternate between 1-4 and a 3-9.
On the 1-4 the FSB was always in view and was annoying. Good luck.
Personally I would look into getting a Flip-up front sight base so you could keep the scope as low on the barrel axis as possible which will of course aid in accuracy at longer distances.