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erosion of bore (in the bore)
muzzle bore sight
front sight (fore / muzzle sight)
sight, to take a (careful) sight
day-sight (day sight)
modular integrated display and sight helmet (Modular Integrated Display-And-Sight Helmet)
axis of the bore
barrel bore wear level
bore
bore brush (swab)
bore cleaner
bore diameter
centerline of the bore
extended range full bore (ERFB)
helix along the axis of the bore
rifle bore cleaner
smallbore (small-bore)
smooth-bore (smoothbore)
smooth-bore artillery
bore guide
big bore
bore corner
bore gauge
bore leading
bore obstruction
bore premature
bore sighter
bore surface
bore-out-of-round
bore-safe fuze
bore-sighting telescope
breech end of bore