I would like to purchase a 30 mm scope level for my Nightforce. I regularly shoot out to 850 yards and may be shooting farther at some point. I've tried to do some research but some products don't even have reviews. Can you guys give me your opinions of what you consider the best level to mount to the rail or scope to help eliminate cant? I am willing to spend in the neighborhood of $100 if need be. I would also prefer it be offset or able to be flipped out for viewing without coming off scope. If I would be better off posting this in another place, please let me know. Thanks.