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don't know exactly what the bore is on this, but it improved the accuracy on my rifle very well, once it was zeroed in the groupings at 75 feet went from 4 inches to 1 inch, there's definitely a lot less curve on the bb's right at the end and wind is making less of a difference during gameplay. i'm happy with it and definately satisfied with it for only 30$ all the other ones out there are around 70.
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