Submited By: Michael L. on 10/08/2008 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. | |