| 摘要 |
A muzzle-loading rifle having vents cut into the barrel near its muzzle. The rifling is timed with respect to the placement of the vents such that all vents are located within the rifling grooves. Depending on the number and size of the vents, the rifling grooves may be relatively wide and the rifling twist relatively slow to ensure that all vents remain in the rifling grooves.
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