(n) :
(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.
(n) :
(ichnology) A raised rim around a footprint consisting of sediment displaced by the pressure of the step.
(n) :
(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.
(n) :
(ichnology) A raised rim around a footprint consisting of sediment displaced by the pressure of the step.