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Primers are component of firearms ammunition. In order to set fire to the gunpowder inside a case, a reliable spark must be supplied. Primers are tiny percussion explosives that flash a hot stream of sparks and create concussive pressure when struck by a gun's firing pin. They fit into a small pocket on the closed end of an ammunition case. If you look at a round of ammunition, the primer is the small silver circle on the end opposite the bullet. Fired cases will have a dent in the primer where the firing pin struck and caused ignition.

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Gunpowder is the driving force behind a bullet. Every round of ammunition has a quantity of gunpowder inside the case which explodes when ignited and forces the bullet downrange. The burn speed and volume of powder used is specifically tailored to the weight of the bullet being fired, the type of gun it is being fired out of, and the desired bullet velocity. Using the wrong kind of powder, or too much of it, can result in catastrophic damage to the gun and sometimes to the person firing it. Ammunition manufacturers and hand loaders go to great lengths to ensure their powder selections are appropriate and safe.

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The main component of any round of ammunition is the case. Cases are usually made of bare brass, although steel cases are also used in some instances (usually foreign military surplus ammunition) and some higher-end pistol ammo uses nickel-plated brass. Cases are tubular, with one closed end, and are the housing into which the remaining ammunition components are installed. A single completed piece of ammunition is referred to as a "cartridge" or a "round".

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Full metal jacket- These bullets that have a copper jacket covering the top of the of the bullet, with the core usually consisting of a softer material such as lead.
open tip match- open tip bullets have this opening due to the way they are made. They differ from the hollow point bullets in that their openings are too small to actually expand effectively upon impact.
Hollow point- The hollow point bullets are designed to expand upon hitting the target and in doing so, provide a lot of stopping power. This also means that the round does not travel through the target, potentially hitting a secondary unintentional target.
Soft point- Does not go through a target as easily. This is achieved whereby a part of the tip still has the soft lead exposed. The idea is that this soft lead tip will flatten upon impact with the target.
Ballistic tip- It has a hollow point that will expand upon impact, but the hollow point is covered with a plastic cap. The plastic cap is shaped to mimic the aerodynamics of the Full Metal Jacket bullet. So this way you get the stopping power of the hollow point, along with the consistency and accuracy of the Full Metal Jacket bullet.

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Bullets are made of a variety of materials such as copper, lead, steel, polymer and rubber.
Primers are made of a copper or brass alloy cup with a brass anvil and are filled with an impact-sensitive lead styphnate igniter. The metal parts of the primer are usually nickel-plated to resist corrosion.
Propellants can vary from black gunpowder to a more modern smokeless powder which contains nitrocellulose. Propellants are carefully formulated to ignite and create an expanding gas that accelerates the bullet down the barrel.

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Rim fire is the type of amunition which the pin hits the rim of the case. The whole bottom of the case is a primer.

Centre fire bullets have a small primer in the centre of the end of the case. The pin hits the centre of that and sets the bullet off. The primer can then be removed and replaced with a new one so the case can be used again.