hexagonal bore

ствол із каналом шестигранної нарізки

erosion of bore (in the bore)

T-handle key with jointed hexagonal socket bit

T-handle spark plug wrench with jointed socket and hexagonal opening

T-handle wrench with jointed hexagonal socket

T-handle wrench with jointed hexagonal socket with block system

T-handle wrench with jointed hexagonal sockets and block system

axis of the bore

barrel bore wear level

bore brush (swab)

centerline of the bore

extended range full bore (ERFB)

helix along the axis of the bore

muzzle bore sight

rifle bore cleaner

smallbore (small-bore)

smooth-bore (smoothbore)

smooth-bore artillery

bore obstruction

bore-out-of-round