If we are talking about lever action rifles?Then the tube under the barrel is the magazine tube.
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The part under the barrel of a firearm is usually called the handguard. It helps protect the shooter's hand from the heat generated by the barrel during firing.
The wood part of a pencil is called the barrel or casing. It holds the graphite or lead core in place.
The part under a bra is typically called the band or underband. It provides support and holds the bra in place around the ribcage.
The part of the microscope that you put under the slide is called the objective lens. This lens is responsible for magnifying the specimen on the slide for viewing.
The part of a wave where molecules are spread out is called the trough. This is the lowest point of the wave, where the particles are farthest apart.
The highest part of a wave is called the crest, while the lowest part is called the trough.