| 摘要 |
The rifling in a barrel of a firearm is modified in proximity to the muzzle to reduce the radial difference between the land diameter and the groove diameter to urge a bullet to expand fully into the grooves and ensure rotation of the bullet about its longitudinal axis and without any lateral velocity component. Preferably, the land diameter is increased to a diameter somewhat less than the groove diameter but in the alternative the groove diameter may be reduced to a diameter somewhat more than the land diameter.
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