Here are the Best Prices I found for these Anti Cant Bubble Levels :
You need a Swivel Bipod as well, I recommend this one: Harris 6-9" BRM-S - http://bit.ly/2nN3yZq
Vortex Lo-Pro Bubble Level:
30mm - http://tinyurl.com/yd3m26r6
34mm - https://goo.gl/66bPzs
1inch - http://tinyurl.com/yd3m26r6
Vortex Standard Bubble Levels:
1 Inch $34.99 - https://goo.gl/4Ew685
30 mm $34.99 - https://goo.gl/9JyYKK
34 mm $39.99 - https://goo.gl/4Ew685
35 mm $39.99 - https://goo.gl/9JyYKK
*New* Vortex Illuminated Rail Mount Bubble Level: $149 - http://tinyurl.com/y7scjcan
Other Anti Cant Bubble Level Options:
$9 Rail Mounted bubble - http://amzn.to/2nfVOjg
$14 Rail Mounted Bubble - https://goo.gl/U8Z9GL
$29 Fold Out Bubble Level - http://amzn.to/2nLsUUV
$29 Burris Bubble Level - http://amzn.to/2n4TN9j
$59 Hollands Bubble Level - https://goo.gl/6QaMez
$78-82 Nightforce Top Ring 6 screw - https://goo.gl/AlgSXh
$73-78 Nightforce Top Ring 4 screw - https://goo.gl/ZaB8bY
$104 US Optics Rail Mounted Level - https://goo.gl/UojL4l
I can't stressed enough the importance and necessity of having and properly using an Anti-Cant Bubble Level on every rifle, especially if you're doing any long range shooting.
It's simple. When the bullet leaves the barrel it's pull directly to the earth by gravity. To compensate for that drop a long range shooter needs to aim progressively higher and higher the further out his target is to compensate for that drop. Most long range shooters do this by adjusting the elevation turret of their rifle scope.
However, if your optic is tilted to one side or the other you're adjustments are no longer going directly against that pull of gravity and you're essentially aiming off to the side rather than directly above your target. This will cause far more misses than impact the more canted your optic is.
It's critical that your optic is always perfectly level when you make the shot to ensure you're point of aim is where it should be resulting in a clean impact verses a miss.
I hope this was helpful. Be sure to use the links above to get yourself a vortex lo-pro or standard bubble level for every rifle you have.
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