Also know as, @saving_ryans_privatez, I am a former Marine and have always had a passion for precision rifle shooting. Now I instruct and love passing on knowledge to students!
Flatline Ops Product used: Halo-X, Bone Spur, TrueBore Level
I am a fan of Flatline products because they are compact and lightweight, yet still rugged and very precise; they also have a really great look to them. In my opinion, they have the best combination of form and function in a level. The Bone Spur, in particular, is minimal on my rifle (a nice subtle touch that catches the eye), while still having the function of being able to see my elevation turret through it on the main magnification settings I typically find myself on.