Explanatory notes
… barrels, breeches, locks, trigger guards, tumblers, levers, percussion hammers, cocking pieces, triggers, sears, … breeches. (4) Morris tubes, etc . (small bore tubes for insertion in heavier calibre guns and rifles for practice on … : (a) Parts of general use as defined in Note 2 to Section XV (e.g., screws, rivets and springs), of base metal …