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(firearms,weaponry) An accurately machined portion around the diameter of a shell of a gun, which acts to increase accuracy of projectile fit to the barrel.
2019, Thomas Gersbeck, Practical Military Ordnance Identification, 2nd edition, CRC Press, →ISBN, page 111:
The bourrelet is a slightly raised surface on the rocket designed to maintain a light contact with the inside of the launching tube to center the rocket when fired.
