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The Vortex bubble level is a great tool to ensure that the rifle is perfectly vertical, does the job its build for, and is bulletproof. The setup is easy and quick (if you have a vise and a good bubble level to level the rifle and scope properly). The narrow design makes it possible to mount it on the position u prefer and does not cause problems with the scope rings, and its big enough to see (if you use both eyes open) when u hold on target. It is also not super sensitive, so u dont bother 90% of the time before the shot, trying to get the bubble betwen the lines.