Given all the favorable comments on the Nightforce line of scopes I'm considering purchasing a 3-15x50 NXS as that seems to be the flagship for durability. My question is the exposed turrets for elevation and windage. Since they are not lockable and are exposed my concern is if they are reliable to stay in place. I will use it on a hunting rifle that gets put in and taken out of a scabbard, sometimes many times a day. Are those turrets reliable to stay in place with that kind of useage or are my concerns unwarranted? I'd appreciate any comments from those who have this scope and have experience with it during the rigors of a hunt. Thanks in advance.