Barrel, action, stock
Primer, case, powder and bullet.
The 3 main parts of the brain are 1. Cerebrum 2. Cerebellum 3. Brain Stem
Ever hear the expression- "Lock, stock, and barrel"- meaning the whole thing? Originally, those were the main parts of a musket- later, a rifle. The lock is the firing part- today it might be called the action. The stock is the part you hold, and brace against your shoulder. The barrel contains the cartridge, and guides the bullet as it leaves the rifle.
There are 3 main parts: The Frame, The Bed and The Springs.
Do a search for High Standard A1041 rifle parts. Numrich gun parts has a good selection of parts for this rifle.
The human skeleton is made up of three main parts. These parts are the bones, the cartilages, and the joints.
The theee main parts of the microscope are Lenses Tube-arm assembly illuminator
Traditionally they were the lock, the stock, and the barrel. This was also the origin of the expression that meant "the whole thing".
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The tree main parts of a triangle are the sides, the angles and the vertices.
The three main parts of a cooker are: 1 Hot plates (burners) 2 Grill 3 Oven